So it's
Batboy v Supergirl: Dawn of Timeshifting.
I think they should have taken a page from Marvel and tried to sell Legends to Netflix/Hulu/Amazon.
I don't think so. The thing about having bits of a shared universe on different networks or sources is that they generally need to stay relatively separate, since they'll have somewhat different audiences and be under somewhat different executives and teams. Look at the MCU -- theoretically it's all connected, but nothing in
Agents of SHIELD gets mentioned in the movies,
Daredevil is off in its own little corner of the world, etc. And years back, when
Buffy and
Angel were on the same network, they crossed over heavily, but as soon as
Buffy switched to a different network, the crossovers largely halted and the shows went more in their own separate directions.
What I'm finding really cool about
The Flash and
Arrow is how intimately intertwined they are, how frequently and casually you see elements and characters from one show dropping in on the other. A show on another network or on Netflix, even if it were nominally in the same universe, wouldn't have that same close, routine connection. It would have to be off in a corner of the universe that only occasionally or distantly overlapped. Now, granted, too many shows sharing a tight-knit reality could get overcomplicated; even with just two shows, the appearance of the Arrow in last night's
Flash was contrived and puzzling in the context of what's simultaneously happening on
Arrow. But I think they could probably pull it off, for the most part, with three shows, though four or more might be pushing it. At least I'd like to see them try.