I've thought about this too, but a bit different. What if we could restart from level 1 and work our way up again keeping all progress and stuff. It would be like the disgaea or white knight chronicles rebirth/reincarnation system. You start over from level 1, but in doing so you get added bonus points you get to allocate to your base stats. That way, if you invested a lot of time into your character, you would see a difference between a lvl 70 100 hour character and a lvl 70 500 hour character. I mean, they already have the system in it "kinda". remember the old stat bonus allocation we had?