Am I right? Let's combine this
Especially if you have a bigger-sized group of people over. No one has to or can sit a song out. It'd be like a real collective staying together, everyone constantly manning the battle stations, each according to his ability. And if the drummer gets off game, the dancers are going to be really messed up, creating the type of high stakes environment that builds character.
Of course you'd need a pretty large living room to pull this off, so Rock Band Dance Rockolution basically can't happen anywhere in the city of New York.