Diablo 4 would have to take the best parts from Diablo 1 with Diablo 2's skill system to make me even consider playing it. As far as I've seen they aren't doing that and are using the parts from Diablo 3 I hated the absolute most.
So if they fix the skills that are unbalanced or not working as intended. I would like to play an updated Diablo 2. I'm done with the 4th iteration of 1.10 though. I'm ready for a new meta and maybe a rebalance to the super uniques that god forgot.
Said it before, but it'd be reeeeeaaaallly nice to get the old renditions of the inner cloister and zones that had a super unique boss removed. The Inner Cloister used to spawn enemies and it actually made the rush from the jail exit to the waypoint meaningful.