In my case, my unlimited data contract is in effect until May of 2013, so i am good till then. If they do decide to end my unlimited after the contract runs out, than I will just sign a new contract in order to get a subsidized phone, sell it and use that to recoup part of what i am going to spend on the non-subsidized iPH5.
It is jumping through a few hoops, but I think on LTE I need to try and keep my unlimited.
Oh, I agree. For me I'm on AT&T so I'll get throttled if I use too much, but I'd rather that happen then get an overage charge so that's why I stay on unlimited (though to be fair I probably don't need unlimited cause I tend to use less than 2 GBs a month, certainly less than 3 GB).
And didn't think about doing something like that (selling the subsidized one to pay partly for the full price iphone). Though honestly if I were in your shoes I'd be waiting until the 2013 iphone (That's what I did, I could have gotten a 4S in February but seeing as I would be stuck with the phone for 2 years I wanted the phone to be a pretty new design when I got it so I waited til the 5 came out).