I don't think Verizon is concerned about which one WE decide to buy, you're right in that aspect. I think their concern is that the series of events didn't line up well to keep the phonemakers all happy and that is what Verizon is trying to do.
My theory:
Gnex was supposed to release on 11/3. It was pushed back for whatever reason, doesn't matter why. Now it's too congested because we have the Razr, Rezound and Gnex all stacked up like ducks in a row. That may have been an okay deal at one point but something happened...the Gnex turned out to be a hugely sought after device. Verizon didn't see this coming and it blindsided them. So they are simply trying to appease everyone as much as possible and by "everyone" I don't mean us. We are secondary, the manufacturers are the primary concern. They want to give the Razr as much time as possible to keep relations up with Motorola and I think almost pretending to throw a bone to HTC, a lesser player in this. As another user said, if they release the Gnex tomorrow, Razr sales will stall bigtime. I think that's a true statement.
So they're milking this thing out as long as possible without completely upsetting any manufacturer although Samsung is probably starting to get itchy, idk. That's why I think it'll release fairly soon. I sincerely think they're trying to give both the Razr and the Gnex enough space that they compete with each other as minimally as possible although some overlap is certainly going to happen.