Honestly folks, the demise of pavement open wheel racing started when they used different cars for both. I know someone will come on here and say it can't be done anymore but that is a load of horse poop. It was done and still should be. Granted it might make a car a little harder to drive if you had to build it to do both, but it ain't supposed to be easy. I think the silver crown cars should be the starting point for a return to this type of logic. Do that and add a reasonable tire rule and you are heading in the right direction.
Now,as far as people wanting to watch dirt over pavement, I can totally understand why that is, dirt is more exciting verses the average pavement track. There are only 3 pavement tracks that I would drive past a dirt track to see and one of them is extinct, Winchester, Salem, and rip Dayton