Well, if CM already said why they won't do it, then it's probably settled.
I already resoldered all my blue switches with black springs, and i'm not an expert indeed. But i'd prefer not to do it again, as a matter of ... time.
Perhaps the keyboard should also have the keycaps glued on the switch top, or a non-expert consumer might broke a key or something, while trying to change it.
In another words, if one proposes a modable keyboard, yes, it would be especially to invite people to mod the heck out of it. If they pay for it, why not.