Looking back at this generation, the rise and fall of the music genre as a whole was something else. I had similar gatherings at my place just to play Rock Band 2. Those were the only times where people would pony up money to me so I could buy DLC. Sorta like a jukebox in a sense. I don't remember when it happened but the hype for Rock Band 2 just died out in a flash.
Like honestly, I think that the rhythm game genre is the modern equivalent of what happened to fighting games in the 90's.