Lofty,
What a great question. It really got me thinking.
I am too young for Can Am, but the idea of few rules and unlimited capacity would result in great viewing.
I don't like to see identikit cars and I'm really happy that we see different approaches to solving the same problem. I also like to see innovation, so the diesels, hybrids and deltawinng cars are fantastic. Something to encourage more variations would be good, and reduce the cost of creating them so that people took risks in doing them, but also rules that are not so static that a winning approach becomes standard.
I like the efficiency angle, but not how it has been applied because currently it means a that drivers are being told by their engineers to go easy or coast in order to save fuel. We cannot see what is really happening.
I would like to see a standardisation on the fuels to ones that we put in our own cars. Super fuel feels like cheating.
Maybe less aero, or less hidden aero. You could see what a car was deploying.
How about street circuits. The Le Mans race is so linked to the city - not just the parade, but the use of public roads and the history of the original route and it is that connection that is an attraction. I can just imagine the Six Hours of London around Park Lane or Trafalgar Square. Mayor Boris would love it!
This is really a discussion over a beer or two....
Aricus