Honestly, If someone offered him a ride, Id say give it a try. Other than that, He'd be stupid to drop what he's doing and buy sprint/LM, Whatever.

As others have pointed out, He's probably better off financially both in operating cost and money earned than he could ever be in a sprint car. Even though I say Racers are Racers and can drive about anything if they are good. The Success Rate doesn't always transfer to another Venue.