I miss Guitar Hero. It had some pretty fun features, a few Rock band adopted. I still think the animations/direction in GH5 and 6 were top notch, beyond anything RB3 could be.
Prediction? Next gen everything will come in full circle, a guitar only music simulation game for a fairly cheap price. If it takes off, it will expand into a full band experience again. As fun as Rocksmith is, it's not for gamers, only guitar enthusiasts.