They didn't have to close the track because the stands were full. The people who could get in were parking on those cotton fields on the road to the track. They was way more than 3000 people there. Also, doubt that many people showed up to see a TV star.
You can not get new blood interested in any kind of drag racing they feel they can not do. Back in the 60 ( sorry Joe ), we all got hooked on nitro racing because we were doing it. Junk yard motor with rods, pistons, valve springs and a blower off of a bus, and we were racing.
As far as nostalgia top fuel, there was never really any such thing. Those cars with the phone booth cockpits, narrow front axel, big carbon injector and VW slicks with monster canards, was not something that was ever raced in the past. It has never had any kind of fan base outside of the guys that do it.