Call me crazy, but I would REALLY like to see IRL have a diverse engine selection. Have manufacturers base their engines off of a street motor, or at least claim to. Allow for V8, I4 turbo, or any mixture, with different displacement and boost limitations. A spec chassis would be ok, perhaps a few different ones, but not as numerous as in F1. Ah, to dream.
Anyhow, here's to me getting some people to go down to Infineon this August. Would totally be worth the money!