If F1 goes behind a paywall in all its major markets where are the new fans going to come from. If you take the example of France where F1 viewing has dropped by about 60% when it switched.
The odds are those who pay for F1 have an income. Most of those under 20 years old don't have their own income. If they do its at the lower end of the pay scales. How are future fans to see what F1 is about especially when FOM spends its time removing clips from You Tube etc.