I wish people could run the double. I loved it. I always wanted to see what would happen if a Coke 600 driver won the race, and that is the only reason why I think they moved the start times to prevent it.
They could always move the race to any start time they wanted to accomidate, but if you dont believe Tony George thought of the "what if" if a Nascar guy won the 500 your mistaken. It would be an absolute disaster for that race if you had a Tony Stewart or a Robby Gordon (2 guys who are fully capable of winning the race in the right ride) winning the race, and then having to run from victory lane for the Coke 600. Plus what does that say for your series when a one off guy can come run your race and beat your regulars.
I don't think it hurts nascar as much.