Well, Mike has always been a "speak first, think later" person, and I do think he meant what he said about these bands being his main thing. However, if we talk about AMOB, for example, when Rich Ward and Paul DiLeo quit, even before the album was released, Mike was like "Yeah, no big deal, the core has always been MO, RA and me, only the three of us", but, later, when he quit, he turned it to be something like "Orlando and Allen were the main guys there" (none of these were his exact words, I just remember things happening that way, and I could be wrong about it".
I do believe Mike and Derek when they say this is going to be their main thing now, but I just don't see this happening with people as busy as Billy Sheehan or even Mike himself.