I don't know... it seems good and all, but there is the possibility of having so many attachments that it will become a hassle. Right now all you need is one controller, and thats it... I don't like the idea of so many attachments. Plus, they might not be of good quality. I know, Nintendo's controllers are really durable, but they let the Mario Party 6 mic go through, and it is quite shoddy. We don't know if the quality of the attachments will be up to par, especially if they're trying to cut costs on them.
I think including the shell with a console should definitely happen, but I don't know about with each controller.