Contracts are bought out all of the time...nothing is ever exclusive....
Well, Verizon's exclusively CDMA until they start rolling out 4G in 2010. No way Apple's going to go through the trouble of re-engineering the iPhone for Verizon. Nothing to do with the contracts, more to do with the components.
That's something that irks me. Do you not understand that GSM and CDMA are completely different and incompatible? You can make petitions and complain on forums all you want, but the fact of the matter is, it has less to do with contracts than it has to do with the internal components. As someone pointed out, CDMA RAZRs were thicker than GSM RAZRs, demonstrating the extent of the differences of the technologies.
And this just goes to establish that Verizon's going to run into some serious problems when they transition to 4G.