You are spot-on! At the moment, F1 has little diversity and lots of restricting regulations. Formula-E is even worse, with everyone driving the same cars. NASCAR, or Indy, is not better either.
All the revolution and innovation is in WEC (World Endurance Championship), it's the one with the Le Mans round. This year, 4 strong competitors arrive in the top class and this is the series to watch http://www.carmagazine.co.uk/car-news/first-official-picture...