Certainly many would be ok with it. The ones it will hurt will be the heavy users that have multiple accounts, is my guess. Also is annoying to families. Game accounts are just game accounts, even if that has grown. Giving the kids an MSN account did not sit well with me.
I and many other people had their accounts completely borked by the required migration. My lifetime license, gone, either through malice or incompetence. For trillion dollar companies, I always have to assume malice.