Honestly with Verizon switching to sim cards (finally!) for LTE, and AT&T doing the same, if the phone can have the frequencies for both in the future, then I might switch. Yeah I travel, and I need that option.
Not to bash Verizon, but the USofA is so stupid with the way they have their cellular spectrum set up. If all cell companies actually used the same spectrum of frequencies, that lil forgotten consumer could benefit and these companies would actually have to compete. I was in India a lilttle while back, and was incredibly jealous of how cell phone companies would fight to get my business and actually have the cheaper rates.
That said, I also hate that companies here think they should switch to tiered data plans just because the rest of the world is so. One of the reasons America is great is because it offers things other countries can't, and hiding behind leveling the field is so stupid just because we don't want to upgrade our infrastructure.
That said, I still have my unlimited plan and AT&T can deal with it that I use it (and yes I do use it responsibly, I use the netflix app and use a video out cable, and I do video conference via Skype on the go). Innovate, don't just catch up. Go so far beyond what the standard is and set a new one.