I have heard of those series, but didn't watch them. Aren't they are warning example though? Caprica got such bad ratings that they stopped showing the last few episodes at first and burned them later off in a marathon. And Atlantis was a replacement for Merlin and didn't even get close to its popularity.
There is no such thing as a "warning example" for an entire category. For any category of story, you can find both good and bad examples. You can even find good and bad adaptations of the same individual story. So it bewilders me that people still try to attribute quality or lack thereof to entire categories instead of to specific instances thereof. It doesn't matter what the broad topic is -- all it takes is for someone to find a good way of handling it. It doesn't matter if there have been some bad previous examples; that's just Sturgeon's Law. It doesn't preclude someone else from doing it well. (For instance --
Johnny Mnemonic was a dark cyberpunk thriller starring Keanu Reeves, it bombed, but then came
The Matrix.)
Also, it is deeply invalid to equate ratings with quality. Plenty of awful shows get terrific ratings, and plenty of brilliant shows have been flops. I thought
Caprica was rather good, actually.
Maybe the time travel story will help a bit there, but I am not sure. The reason why they added it though is that even the Krypton producers don't think the series would be otherwise appealing to enough viewers:
http://www.hollywoodreporter.com/li...adam-strange-hawkwoman-comic-con-2017-1023589
The article never says they "added" it; there's nothing in their words to preclude it having been part of the premise from the start, just not a part they revealed until they were ready.
Personally, I think it's disappointing that they felt that way, just as I think it's disappointing that
Gotham ended up cramming in a ton of future Batman villains rather than doing the grounded crime drama about Jim Gordon's early career that I thought we were going to see. Producers have too little faith in audiences. I mean, we're perfectly capable of falling in love with a brand new show, something that has no connection to anything we've seen before. So why is it that when anything is based on an existing premise, there's this belief that audiences won't "connect" unless you cram in a ton of stuff they recognize? Why can't it just be a distinct, earlier story in the same universe, something that earns the audience's interest through the strength of its own characters and storytelling rather than using familiarity as a crutch?
It wasn't always this way. The makers of
The Young Indiana Jones Chronicles, for instance, made very little effort to connect it to the future events or characters of the film series. Indy's father appeared periodically, but they never introduced a young Marcus Brody or Rene Belloq, or had Indy go on an adventure with Short Round's future father, or something like that. There was an unmade episode that would've introduced Indy to Abner Ravenwood, but it was just one late script out of an entire series. They didn't feel they had to cram every episode with references to familiar things in order for audiences to "connect." The connection to the films through Indy himself was just the hook to attract our attention -- at which point it was up to the actual stories themselves to earn our continued interest, not just continuity porn as an end in itself. (Heck, even young Indy was barely recognizable as the character from the films, and the TV show had none of the supernatural elements of the movies. I think producer Rick McCallum once suggested that the movies were fictionalized adventures of the archaeologist whose real formative years were chronicled in the show.)
People say they find the idea of a story about Krypton boring because it's never been that interesting in the Superman stories they've seen, but I think that's looking at it the wrong way. The Krypton we've seen isn't that interesting because we've seen so little of it. Its past is mostly a blank slate. (It was explored plenty in the Silver Age comics, but I'm talking about the experience of the typical modern-day fan.) And that means an imaginative storyteller would have free rein to create anything, to build something new and rich and fascinating in that untouched territory. As a science fiction worldbuilder myself, I see that as a great opportunity for creating a whole new, complex, fascinating alien culture.
But a story about good time travelers trying to stop evil time travelers from altering history... That's a lot more constrained, and a lot more familiar. it sounds a lot like
Enterprise's Temporal Cold War, and like
Timeless, and like a bunch of other things we've seen before. Hopefully there will still be room for some engaging worldbuilding of historical Krypton, but going for time travel as the main hook is rather hackneyed. I mean, heck, how many different time travel shows have been on the air in just the past year?
Timeless, Legends of Tomorrow, The Flash to a degree,
12 Monkeys, Travelers, Frequency, the short-lived
Time After Time, that dreadful sitcom
Making History, Hulu's
11.22.63,
Dirk Gently's Holistic Detective Agency to an extent,
Outlander in its own way, and of course
Doctor Who as an import. Wow, that's double digits, and over 3/4 of them are still in production. Time travel is an incredibly overused trope. Heck, it always has been, but we've been especially overloaded with it this past year. Not to mention that two of the current DC-based shows already have time travel themes.