i dont think verizon will switch to GSM or HSPDA for a while.... they DO have the money to swap, but in some areas i believe they still have the legacy 1X RTT network and on top of that the cost of making customers swap devices to get a GSM vs. a CDMA will be a hassle.
Honestly, Verizon always has their own OS they put on every device and IMO screw up and lock down the capabilities of each handset they sell. Apple and AT&T's exclusive contract is working great cause of the fact, AT&T wants the phone and doesn't care what is on the device and lets Apple do what they want pretty much.
Ive fought the Verizon battle, still have a verizon phone for work , but my iPhone through AT&T is for personal use, so im on both ends of the field and have experience with both parties.
Anyways, anything is possible, only time will tell