Oh it's the worst man! Having to constantly delete songs or switch songs out to a separate hard drive. At least with RB4 you could potentially have the entire database on your hard drive on next gen consoles, but as I & many others have said it's a far far stretch before that happens. & Yeah I agree, what could be next for harmonix?
Having too many songs to choose from is hardly the worst thing in the world.
Eliminating the song limit by using RB4 would be cool, but no keys = no dice as far as I'm concerned.