I say the sooner a lot of people start hitting level 75, the sooner there will be more limit breaks and interesting "expansions" possible, making spending more real money necessary which would not be so distasteful imo. Plus, making the game easier in some way is something I think we all can agree on would be good, ie. the game is hard.
Reality is, a lot of people have quit cuz of having difficulty in attaining LBs, and having large exp expanses with little or no party invites, and perhaps because of experiencing the addictive nature of farming gil feverishly for days with your goal in sight only to (dishearteningly) have the really great stuff go up in price or disappear.
On a different note, I think at level 75 you should get some sort of mega moghouse enhancement so that you are all set to start a new character, which will take forever... times two.