I still hold out hope that the CM's will return, although some things about them may not be identical to the first two.
My take on things is that, when the CM's started production, there was 'The Plan'. The Plan predicted that the CM's would sell a certain way, with a certain mix of physical/electronic sales and a certain level of interest from the Retail Channel. Mercs comes out, and someone says, 'Hmm, that's not what we expected. Well, lets release a house book and see if it is the same.' Kurita comes out and that someone says, 'This is ALSO not what we expected...Yeah, this isn't going according to The Plan.' Does that mean no one bought them? No. Does it mean they were too expensive to make? Not necessarily. It means, they were produced under the assumption that they would sell a certain way when released. The way they ACTUALLY sold was different. The difference between reality and The Plan caused someone to put the brakes and decide to better match the CM product to how the market was consuming it.
I think it is still possible for the CM's to come back, but they can't be exactly the same as the first two. What will have to change in any future ones? No clue. That would be for Ray and Brent to figure out!