There was a lot of space between 5 minutes and 1 hour that WotC could have explored. I'm not sure why they settled on 1 hour. I do wonder whether it will change in the revision, but I see WotC more likely abandoning short rests entirely in favor of putting everyone on the same full rest schedule.
This is possible, but I think it somewhat unlikely. For a lot of extant things, they can fix it, but what could they possibly do with the Warlock class that would break free of its short-rest dependence? Fighter will probably be easier (tie Action Surge etc. to
half your proficiency bonus, rounded down), but Battle Master would be very awkward as it stands. You currently get
more than your proficiency bonus' worth of Superiority Dice for
each short rest (at least until very high level, where it balances out). That would require getting PB
squared per long rest, which...well, that's gonna make for huge early novas and then a really really boring remainder of the day.
So I'm not sure if they can divorce things from the short rest absolutely 100%--not while keeping backwards compatibility with prior content. I strongly suspect that the "50th anniversary" update will heavily
reduce dependence on short rests, but I dunno if they've got the gumption to totally ditch them.
Perhaps I'm wrong though! Maybe there will be some kind of new recharge mechanic that won't give Warlocks/Battle Masters/etc. infinite resources, but will give them the resources they need to keep up. E.g. maybe once a day they can just regain all Warlock slots/Superiority Dice, and instead of being a
crappy capstone, getting extra slots/dice due to rolling initiative will be a baseline feature. At this point, it's all speculative--but if you've watched the new subclasses as they come out, they definitely are moving further and further away from using short-rest abilities and into using PB-per-long-rest abilities.