7D has dual processors, plus it's more environmentally sealed, so there should certainly be reasons for optimism that the t2i would be less likely to overheat.
The question is what is the time of a typical take you shoot?
I shoot mostly performances, concerts, long interviews, lectures etc, so the 12 min limit alone is quite a show-stopper in such situation, but along with the possible overheat it's a complete no-go for me, unfortunately. I like the picture, but...