No, Activision is just trying to milk the teat dry. MTV/EA are doing the right thing by focusing less on flooding the market with new doodads, and more on releasing DLC. Rock Band Beatles is kind of a special case, because if there's any band that absolutely deserves their own version of one of these games, it's them. Lego Rock Band, eh, it's for kids, but I can see why some people think it's a cynical money grab.
But a full Guitar Hero : Van Halen, in ADDITION to another full fucking bundle release with minimal gameplay changes? Seriously, that well is dry.