The 2006 movie was OK, but a proper reboot could be so much better. Plus they'd have to overcome perceptions left by 'Quantum Leap' and 'Seven Days'. I think too, just IMO, they should go back to the more "observing history" theme of the original rather than "patching timeholes" of the movie. But there's definite possibilities.
Idea: not a reboot, but a new team revving the abandoned Time Tunnel Project, building on what has gone before.