If there's any series/franchise ripe for a true comeback: It's The Terminator.
It's pretty widely agreed that every movie after 2, which is over 30 years old now, kinda sucks to varying degrees (Tho 3 might have it's moments).
They've tried to soft-reboot it not just once, but twice, both being pretty abysmal failures.
In the right hands, I think it's very possible for there to be another critically-acclaimed and successful Terminator movie, I don't think it's impossible.
I think the problem with Terminator as a franchise is that time travel becomes too complicated as a plot device after a while. Terminator and T2 just use it to hang an action movie premise on, but that only works for two movies before the concept just runs out of steam. Some of the later movies might have been on to something by just having them be war movies set in the future, but they got too weird and complicated for their own good.