This coming from the company that funded Guitar Hero in the first place? The big innovator and financier behind the GH series WAS Activision. Harmonix didn't really innovate past GH, they just took an existing concept and raised it to the next level. Most big companies are the only ones that CAN innovate, and when companies like Activision are willing to take a risk and team up with smaller companies like Harmonix. Most small companies end up making titles like Carnival Games or other knockoffs. Here, activision is taking Rock Band a step beyond Harmonix's ideas with the updated guitar and drum controllers, not to mention the music creator.
As a consumer who doesn't own rock band, I feel as though if this game were released at a time such that it would compete with rock band, it would sell more copies because it adds functionality and innovation to the core experience. For me, it's a no brainer. The question is whether it's worth it for the people who own Rock Band already.