My major point is, that an iPhone on the CURRENT state of CDMA networks, would be gimped. That's why it won't happen anytime in the near future.
AFAIK, LTE does not support data + voice running simultaneously. Only faster data speeds.
If anyone can prove otherwise, please post.
If you can't, now is the time to quit dreaming of iPhone on Verizon.
The only way iPhone came to Bell and Telus (our CDMA networks) in Canada is because they got chunks of the GSM spectrum and built their own GSM networks.
EDIT: AND, to top that off, Apple would need to engineer/produce an entire new CDMA device.
Actually, VZW has a plan for these scenarios. VoRA is being tested right now and will allow devices on 3G to use voice & data concurrently. Taking this into account, a VZW iPhone is more than probable:
1. iPhone 3G type device. Phone will use EvDO for both voice and data, very similar to AT&T's iPhone 3G/4G. Then when LTE is more prevalent they will do a new iPhone to use that network, similar to the iPhone to iPhone 3G upgrade.
2. iPhone 4G. Phone will use EvDO for voice using VoRA and LTE for data (ala Evo).
The evolution will be towards VoLTE, but that is a little down the road.
A VZW iPhone is not impossible. I don't understand some people so dead set against it.