I don't see that single series that focus on portals between worlds are an apt comparison.
Star Trek is not a single series, it's a half-dozen or so. And it had the Mirror Universe spanning two of its series.
That's a better comparison at least. Maybe they don't want half of their series off doing their own thing and rarely touching base with the others.
But as I keep saying, there is absolutely zero reason why
Supergirl being in a separate universe would make it hard for crossovers to happen. Earth-2 characters were interacting with Earth-1 characters
on a weekly basis in the last season of
The Flash. There are plenty of ways they could make crossovers as routine as hopping through the Stargate or the transporter. Heck, with dimensional rifts and tachyon accelerators and alien technologies and so forth, it's easier to justify the Flash popping across dimensions for lunch with Supergirl than it is to justify Team Arrow commuting back and forth between Star City and Nanda Parbat as casually as they do. At least interdimensional travel is near-instantaneous.
Sure seems there's a lot of emphasis on shared cinematic/TV universes these days...
Yes, and again, what matters to the marketers is that they are shared
narrative universes. A single narrative universe can contain multiple physical universes.
I'm honestly not arguing that merging Supergirl in is absolutely the best option (or the worst) but trying to see why they might want to do that.
I've been having this debate online for months, and I have yet to hear anyone offer a credible example of something that could be done with a combined universe that couldn't be done just as easily with two separate universes and a casual use of dimension-crossing technology or superpowers.
Heck, in the comics, the Flash has the ability to cross between universes under his own power, no special tech needed. Since the TV Flash's powers keep growing, it'd be easy to show him learning to do it on his own. And maybe teaching Supergirl how to do it too.
The thing is - that was part of theplot for one season's arc. It's about the fastest man alive, not about parallel words.
Sure, but it
used parallel worlds as a story device. That's what I'm saying. Now that they've added parallel worlds to the rich mix of ideas they're playing with in the Arrowverse, why would they want to backtrack and get rid of that idea? The logical thing is to develop it further, as one of the many threads at play in this ever-growing franchise.
Fringe was not centrally about parallel universe, except for abou 1 1/2 seasons (and some other episodes here and there)... first season was kinda like X-Files, last season was like Temporal Cold War... ultimately "Fringe Science", which incldes a lot of sci-fi tv/movie favorites
The events of the first season were ultimately explained to be the actions of a group preparing for an invasion from a parallel universe, and the season ended with Olivia crossing into that other universe. The second season (where the show really started to kick into gear) was driven by the actions of infiltrators from that parallel universe, and eventually revealed how everything that was happening was the result of Walter Bishop's actions in crossing over to that universe decades earlier. The third season alternated between universes freely now that the secret was out and the storyline escalated toward a climax. The fourth season reset the timeline, but kept both universes in play on a continuing basis, with the main villain's plan playing out across both universes and ultimately geared toward collapsing the two universes into one. So, yes, in fact, everything in the first four seasons of
Fringe was fundamentally about the parallel universes, even though that fact was only gradually revealed. For that matter, even the events of the "rebooted" season 5 were explained as the long-term effects of Walter's action that created the disruption between universes. Superficially, the show did reorient itself a lot from season to season, but it's remarkable how cohesive it all was in the end.
Historically (Silver age on), Superman and red-cowled Flash have been in the same universe... as solidly a part of the mythos as the cape or red trunks.
Who cares? Historically, Iris and Wally West and Jimmy Olsen were white. The TV show is not the comics. It's a new work inspired by the comics.
Not quite a fair comparison.
Stargate -- that is the title of the show, and is the premise of the show... so yea, they should be hopping everywhere..but nearly all of the worlds were in the same universe.
Sliders - again, the premise is parallel dimenesions
Syfy's Flash Gordon -- it was that portal thing (and focus on Earth as well as the early ridiculous versions of things like the squaking black caped "Hawkmen" ) that turned people off... I mean, fine for the reason Flash & company went to Mongo...but that hopping back and forth in the beginning made it lame
Chronicles of Narnia - it' the needed prompt to bring the characters in and out of books...but only used at the beginning and the end of the story (which would be the equivalent to a season, IMO)
Oh, come on. Obviously each individual example is different, and obviously by cherrypicking the parts that are different, you can pretend that each one is somehow "ruled out" by not being exact enough and thereby chip away until there are no examples left. But that's intentionally missing the point. The point lies in the
similarity, in the fact that there are themes and concepts that are reused across many fictional works. The fact that there are differences too doesn't disprove the similarities, because obviously any number of works in a list are going to have
both similarities and differences. What matters is the thing that unifies the list, the common theme that's explored in many variations. Fiction is all about finding new variations on recurring themes.
explain to me again why they would erase earth 2 and 3 again?
Explain to me why, if they're going to keep those in play, they'd have any reason to get rid of Earth-SG at all.