Two thoughts:
1) Numerous folks have spoken about the need for a durable wheel on PBP. A rear wheel with a Rohloff hub is symmetric (no dish) and thus inherently stronger than a dished rear wheel with cassette (just like your typical front wheel is stronger than your typical dished rear).
2) A couple of days ago ascending Lookout Mountain (on the paved road to the top) I met a roadie with a bike upside down waiting for service. I asked if I could help, he said, "I don't think so, it's a broken derailleur hanger." I agreed with him that I couldn't help.
It's impossible to break a derailleur hanger on a Rohloff hub.