True ^^ But actually Le Mans is the only race that counts, isn't it? In 2011 Audi won "only" Le Mans as well (but what a win !).
It wasn't the car of the year for sure but need to bear in mind that Mazdaspeed wasn't Mercedes , nor Jaguar or Peugeot. The car was prepared by Oreca which was at that stage of its history not what they are now. Anyway no factory team have any interest into that technology as it is considered as to much petrol consumer. Only Citroën tried to develop it seriously and that has almost cost them to bankrupt. But still Wankel engine aren't completely wrong. Only a lack of interest from industry that leads to know development for motorsport.