Imagine having it like it was in the 60's... Structured racing like Aurora did starting with local races and progressing to a national event, with the final race televised for the world to see. Win a new car... Special promo cars to the local and regional winners. It's nice to dream...
As far as a track set, if AFX would make the oddball sized track that's missing from their arsenal, the Clubman would be the bomb.
As an add on, throwing a functioning pit road into the mix ( X 4 for a 4 lane) would be cool. The inside lanes could access the pits via a cross over, or better yet the pits could be on both sides of the track to maintain the lane positions. The pits for lanes 1-2 can be staggered from lanes 3-4 with a 3" gap between and have both inside lanes nestle together. Make the pit stops a required part of the race, automate the switches to make the turnoffs part of the pit requirement, and maybe put a flashing light at the entrance to let the driver's know they have to pit.
The technology is available for a timing system, with pit stops included in the mix. I would imagine the cost would be a factor, but as an available option this might be a fun, cool accessory to put out there. If it is a professional grade timing system with automated pits, I think it would be worth the added expense for guys looking for a ready to roll set up.