They won't do any of the above directly. Carriers don't make phones, but they do market and sell them (because they own the customer). They'll simply refuse to do so for Android phones that aren't neutered in ways acceptable to them.
"Hey Motorola, of course we'll do a big marketing push for the Droid 9000, so long as it complies with our guidelines for handsets on our network. You have made sure users can't install Google Voice, haven't you? What's that? They can install any software they want? Well, maybe we'll just go for that Samsung device instead. See you next product cycle."
"Hey Motorola, of course we'll do a big marketing push for the Droid 9000, so long as it complies with our guidelines for handsets on our network. You have made sure users can't install Google Voice, haven't you? What's that? They can install any software they want? Well, maybe we'll just go for that Samsung device instead. See you next product cycle."