You can't really repurpose a racetrack like you can a computer store or bike shop.
Actually a windfarm might make sense there....based on our experiences trying to keep the pit canopy from going all Mary Poppins on us....
I used to sell to a manufacturing company called ****. IN 2009 they went tits up and the CEO (and part owner) of the company led an MBO and bought the company fom the receivers within the week for pennies on the dollar, renamed the comapny ****2009 and carried on as though nothing had happened. Except that people who were owed money or product didn't get anything form the new money even though, on the outisde , it appeared to be the same entity.
When ownership changes so does liability. Pay for a TMP trackday today and potentially see TMP2012 tell you that your tracktime was a contract with the previous company and they aren't honouring it. That is what could happen.
I don't know which would be worse for the neighbours.... a race track or a Wind-farm, probably both hated equally.