Stewart said after Nemesis that he was done with the character of Picard, that he had explored that role completely. True people can change their minds (Nimoy), but I don't think we'll see Stewart-Picard again, and it's just too soon to be talking about a TNG reboot. We got TNG only because the TOS actors were getting too old to keep reprising their roles, yet fans clamored for more Trek. This Abrams cast has tons more fuel in the tank. We're in for at least one or more theatrical movies, maybe a spin-off TV something if we are extremely lucky. A TNG reboot is a decade away, but honestly, I don't know why anyone would go there instead of pursuing something more original.