This thread hasn't "run its course", because each time we get major crashes, different causes and different lessons are there to be learned.
If you visit CN home page ATM. It says two things. Ferron was hanging from the bridge today. Hayter has fractured collarbone. There is nothing that specific in this two cases. One could be prevented with some sort of fence like barrier and another with more protective apparel. Yes, even falling from a bridge. Even this is so common in pro peloton. That it needs the appropriate attention. On how to prevent from it to happen so frequently in the future.
The real question hence is on why doesn't it get done.