It's really not as bad as people think. I just came back from San Francisco (so I do know a thing or two about "perfect conditions", and honestly the ambient temp during the 10k's was just fine (they ran about the same times as Derrick and Levins ran last year, if not a little faster). It gets hot in Texas, but at night it's amazing here in ATX. They started at around 9:30pm, there was a slight breeze and water stations on both straight-aways. It's rained a lot recently, so that helped bring down the temps at night (according to my phone it was ~76 degrees).
If Jordan got killed by the heat, then she needs to get checked out by a doctor for some underlying problem. I think it's more likely she just had a bad day, and that's it. It happens. The other oregonians haven't struggled.
Look at the times over the past few regional meets: Wheating 3:37, Greer 1:46, the 5k's in 2010, Saina and Kohl looked fine, etc. They haven't suffered. Look at the Flotrack interviews too, particularly in 2010 when they first did this, they asked athletes about how the heat was affecting them and most said it was completely fine.