I have a strange feeling this will catch some wind but end up lost. Great idea, but it's just the status quo for something that's been attempted time and time

I have a strange feeling this will catch some wind but end up lost. Great idea, but it's just the status quo for something that's been attempted time and time again. No sane person is going to run their site and say, "Get a Facebook account if you want to sign up for ours." Would you? They'll have an option: Login/register (or login through Facebook) if they really want to support FC.