Also, just a side comment on open-wheel. I really believe the dynamic difference here is front-engine/ rear-engine. Obviously, sprints have open wheels, but have proven to be a great predictor of success in Nascar, because having a front engine, some of the handling characteristics are the same. It might even be a better training ground because you have to learn some finesse and cannot just beat and bang fenders.
So really this thread is about the rear-engine formula car drivers coming to Nascar, because the up and coming sprint car guys like Kevin Swindell and Ricky Stenhouse Jr are only pointing towards Nascar these days.