In the scenario you describe above, that would limit National Events to Top Fuel, Nitro Funny Car, Pro Stock, Pro Mod, Alcohol Dragster, Alcohol Funny Car and Pro Stock Motorcycle. They are the only classes that race heads up.
Explain to me how in the world you could have a class like Super Stock run without a breakout/index? You Can't.
What is really being said here, whether you meant to say it or not, is no sportsman at National Events. I will be the first person to admit that when I am at the track I head for the RV/Beer Stand when Super Comp or Super Gas pulls into the lanes, but I am not in favor of eliminating those guys from the show.