I'm actually hoping that restrictions will keep an MMO from happening to Kingdom Hearts. It already seems like the fanbase isn't exactly thrilled about having games blanketing different consoles... Could you imagine the complaints against an MMO for KH? *ESPECIALLY* if Squeenix tried to pull something off like Blizzard's been doing. "Want a cosmic-fruity-looking unicorn mount for your 100 mount achievement so you can have a dragonhawk mount later down the line? $25US and you can use it on all characters across all servers on one account! How about this vanity pet? $10US! Also, we have a few plush toys that come with an activation code for a vanity pet... another $xxUS!"
Not to mention I'm sure people would amp up the complaints when they realized they'd have to pay subscription costs each month so servers could be maintained, patches released, updates, downtime for maintenance (which if it became anything like Blizzard's can become quite annoying at times; I've never gotten into FFXI so I'm not sure how Squeenix does it)... ugh. Yeah, thanks but no thanks.