By soft reboot, I mean something like Mass Effect: Andromeda, where it isn't a full reboot but the previous games are somewhat disregarded in order to focus on a new story arc free of previous lore/characters while maintaining the style and flavor of the universe?
For instance, I think Halo could definitely use a soft-reboot after the Reclaimer trilogy/'saga' is finished. The lore is getting completely convoluted and massive, and expecting people to play 5-6 games plus read books and watch TV shows is a bit too much. The franchise has also leaned on the Covenant as bad-guys for almost 15 years - that's too much.