Either a reboot or continuation of a show.... what would you want back?
Show that ended on its own terms or show that was cancelled.
I wouldn't mind if they rebooted Firefly... probably too late to "continue" it.
Or a continuation of Alphas.... fucking Syfy.
Loved both those shows but not sure I would reboot. Mainly because I think there is already a lot of good Sci-Fi out there with (Dark Matter, Expanse, and Star Trek Discovery). As for Alphas, Superhero TV shows and movies abound so that is pretty well covered as well. The Gifted and Legion are probably my 2 favorites when it comes to government conspiracy type shows dealing with people with superpowers. My top 3 are
1. Profit due to it being well ahead of its time. It centered on an exec at a multinational conglomerate and all the shit you think about when you think of corporate greed, US financial crisis, etc. were epitomized in the lead character. Unfortunately Americans at the time couldn't wrap their head around watching a show with a lead that was not heroic in the least so it got canceled after 3 episodes.
2. Twin Peaks - Weird as **** and really still nothing that captures Lynch in all his insanity.
3. Terminator: The Sarah Connor Chronicles - I liked this better than all the movies.