Many shows have been revisited in the last years.
We heard something about Buffy too, but so far we had nothing more than voices and whispers.

In any case, I hope we'll have something in the next future.
Question is: what would you rather have?

Revival: sequel from original series, same actors and cast, follows the same story
Sequel: derived from original series, but could have also new characters and new story
Spin off: centered on a secondary character from the original series
Reboot: same concept, done again from the beginning, maybe set nowadays

None of the above. Hollywood isn't running short on new concepts. Redos (in whatever form) tend to suck. For every Battlestar Galactica there are a dozen Knight Riders.

Having said that, good writing will cure most T.V. sins.