I would love to see the factories cut their racing budgets and go race prototype sports cars instead. Sports cars have long been more technically interesting than F1 and now the discipline is more relevant (not to mention more exciting!).
So c'mon BMW, Toyota, Renault, pack your bags and go attack Le Mans (stop by the states for an ALMS effort too!). F1 is over-rated and dull. I attended the Petit Le Mans last week and I saw a lot of potential for growing the sport. The fans were passionate and excited about cheering on their favorite marques (some even had tattoos pledging their alleigance!). Imagine how big the sport could get if the factories dumped F1 and gave it a try!
Sports car racing has upset the apple cart before, in terms of the world championship heirarchy. The FIA had to kill off Group C with the 3.5 litre formula! The FIA isn't in control now, however, so there won't be any FIA shenanigans.