Your Xbox should only freeze more frequently, not die. Even 20 degrees hotter ambient temp is almost negligible compared to the heat the 360 itself creates. RRoD is unrelated to overheating 95% of the time anyway.
Say what you want.
I've gone through 7 XB360s, not including the one I'm using now, and they ALL died from either RROD or E74 and they were ALL in hot environments.
Based on my own personal experiences, my XB360 WILL DIE if I play Skyrim for an extended period of time over the course of between one to two weeks.
I REALLY, REALLY hope this texture issue doesn't turn out to be like the XB360 version of Rage. I know Bethesda didn't develop Rage, I'm just saying.