I wouldn't expect it to matter for people who have one account, or a couple of them (one fannish, one parenting, one for knitting projects, etc.) But people who are legitimately managing several dozen accounts probably have a trusted person they could appoint as "if I'm not available, get necessary permissions from [name]." (It's been my experience that many people who are managing dozens of accounts occasionally turn some of them over to friends temporarily, either to post updates or edit styles or whatever.)

I don't think it'd be a great hardship on the users to require such a person for account numbers of whatever quantity is considered "many."