News that Viacom is offloading Rock Band developer Harmonix came as a bit of a surprise, but when you consider how much it costs to make those games (between standard development costs, licensing costs, peripheral manufacturing, etc.), and how much they have to make to recoup those costs, it’s easy to understand why someone would decide to sell them off. But as GatsuBlackSword explains, Harmonix’s fate is directly tied into the genre they helped create.
Harmonix has been around for 9 years now. They have always innovated. Frequency, Amplitude and Rock Band were nothing more than amazing, no matter where they get sold to they will continue to make some great games.
Unfortunately the "Music" genre is getting massively over-saturated and people are loosing interest. Entertainment has trends, some last for many years and some come and go.