Rockband figured out how to do it, though (multiplayer).
I'm still feeling tragic that they just abandoned the whole series of RB/GH games even though there was/is a huge player base. They made money off of every new song they put as DLC, I hope someday another version will come out, or someone else will pick up the ball.
I didn't mind the plastic instruments. I'm a singer and a keys player, and I'm taking guitar lessons, and tried the drums.
The best part was that you had the multiplayer - chatting with 3 other band members between songs in a setlist was amazingly fun and a great musical outlet! Now I have this and am really learning guitar, but if we're listing "would be nice"'s those are mine.