According to Harmonix, poor-selling music franchise Rock Band is not dead. That, of course, doesn't mean we should look forward to Rock Band 4 this holiday season, but it does mean DLC will continue to be supported.
“We’re supporting our community, we’re not going away: Rock Band’s not dead,” said Harmonix's John Drake. “We’re not making another retail release this year, but we’re probably the most aggressive company, I’d say, in videogames about supporting our community with digital content."
“I think we’re really proud of how the game turned out, there’s a lot to explore in the game and it’s still making money, it’s still a profitable day-over-day thing for us to have downloadable content sales," Drake added.
Personally, I still play Rock Band 3 occasionally, when I want to blow off some steam, and I'd like to think that the next few years will be very kind to the game. It is, after all, the best music video game that has ever been released.