That's my thing. I like the idea of a single signing day in the spring semester, but I think they need an early one as well, and don't allow official visits before the early signing period. That way, guys like Carr or others that know early on without a doubt where they want to go can go ahead and sign so that they can avoid the calls the rest of the year and focus on school. For those that are really undecided, they sign in February after official visits.
Also, it'll help eliminate some of the BS with guys that commit just to hold a spot. If someone is doing that, then an early signing period would at least tell the coaches that they aren't really committed.