Ian - I think luck has a huge deal to do with it. For instance, with the rain I posted about above, we recevied 7.5 inches of rain in a 7 hour period. Olympia Fields, 20 miles south, received approximately one inch. Shoreacres, 20 miles north, received 2 inches - but got killed three days earlier in a storm that totally missed the western and southern suburbs of Chicago.
The hot temperatures, coupled with extreme humidity will wreak havoc on bent grass alone - now couple it with a foot of standing water. The first two conditions can be managed - add the third, and I don't care how good someone is, there is going to be turf death.
This summer - in my opinion - luck is playing a large part....then again, I've seen signs of stress on every course I've played.
For instance, Merion, with one of the most accomplished supers around, had issues when I was out there. Their first and second greens didn't look so hot - any idea how they are doing now?