Nostalgia aside, mother 3 was better than earthbound imo. I don't mean that lightly since earthbound is my favorite game of all time. I have a feeling if they did remake it and itoi was involved, it would be totally different considering how much he has changed as a person.
Anyway this is going to sound insane but I'd like a remake of final fantasy 10 or at least a super touched up version. Fix not being able to control the camera, get rid of stupid gameplay bullshit like winning chocobo races to unlock ultimate weapons and getting one shotted during ambushes and then fill in all the plot holes.
Also a new rival schools would be neat.