I've heard a couple people suggest that in the future, they should add content that would make max MP matter again, such as enemies that have a really wide 40MP/tick decay (as an example) that puts a large max MP pool back into play.

The problem with that is that that creates the opposite problem- now Galkas that like playing mages are horribly handicapped and probably would not ever be allowed to go along, especially if they're filling a role like main healer. It's not a design choice I welcome on either side of the fence.