Interesting to hear his thoughts on it. Unfortunately I don't see F1 moving away from hybrids just because they are trying to keep up with industry demands, and full combustion is on it's way out. But his suggestion about making the cars more draggy rather than less is a cool idea. Make it about slipstream and stuff again and get rid of DRS. Sure you'll have lower top-speeds which will upset some people, but it could absolutely give better racing which should be the goal.
Look at the MX5 series, they don't have DRS or anything and they have some of the most exciting racing I've seen in a while.