I get a chuckle out of the comments that say NASCAR has to go back to it's "roots". With respect to the tracks, yes. But with respect to the cars, that horse left the barn a LONG time ago. There was a time, when a racer went to his local car dealership, and bought a 2 door coupe/hardtop, with the big engine and manual transmission, and built it into a "stock car". Those days, however, ended in the mid-late 1980, when Detroit went crazy over FWD 6 cylinder cars, and NASCAR went to "fabbed, silhouette" cars.
For that matter, the NHRA went the same way, too. The "Pro Stock" category used to be a really cool division, with late model Camaros, Mustangs, Barracudas, etc, with just a bigger engine and bigger slicks on the back, to differentiate it from a more common /SS racer. Now, the "pros" are tube framed, purpose built race cars.