I so sorry to hear that the participants encountered so many problems while trying to run this race.
I was in the audience as an accidental spectator last year. Initially, I was quite angry that the strip was shut down. I didn't know there was a marathon and it was nearly impossible trying to physically get anywhere need the strip that day. We ended up parking at the Bellagio since they have a side entrance on Flamingo.
Well, once we heard the music and saw the runners going by our anger turned into excitement. Every time the fountains went off at the Bellagio the runners cheered and became re-energized. It was truly a magical site to see.