A race promoter who is threatened year on year that they will lose their race if they don't move to a night race, who's almost at the end of their current contract so need to negotiate a price for a new one, and who's threat is to drop the V6 turbo F1 race in favour of... the V6 turbo IndyCar series
Its a weak argument. He needs promoters who are firmly in F1s pocket (state funded races with long contracts) to join him to put some weight behind it.
But still I go back to my main point, what does he expect the FIA to do? Change to another engine formula after only one season, throwing away the millions of pounds spent creating the V6s and giving manufacturers 8 months to design and build new engines? Being sued by an angry race promoter will be nothing compared to being sued by Honda, Renault, Ferrari and Mercedes for the wasted development costs, 6 years of lost earnings from selling the engines, and other damages!
People clearly don't like it, that's fine. But realistically, other than a dump valve and some tweaks, what do you realistically think is going to happen? It's done. F1 is quieter. Accept it and move on.