Activision: You might be able to bring them back to glory. Emphasis on "might"
EA: They're pretty massive, and they've been your distributor. Wouldn't you like them as overlords?
Konami: You could teach them a few things about making good American products. Oh, and you could rework Beatmania for the U.S. as an Amplitude revival. Konami has also been getting better at music licencing in Japan recently, I'd dig some J-rock DLC, and your plan to make a Japanese version of RB could work under them too.
Disney: "Jonas Brothers: Rock Band"