Probably for the best, if we're being honest. The cracks show, when he has to take on a bigger role, and the cost associated for him, to be 'second catcher' isn't worth it. There are guys like Vaughn (and to a much lesser extent, Collins), that can DH/1st/etc in the rotation.
Personally, I don't think Collins will ever do anything at this level. I think he will be out of the organization within 2 or 3 years, but we will see.