Well, assuming Lewis breaks Schummi's record next year, Mercedes could then step away. Without direct support from Renault (French government), Alpine will probably fold as an engine supplier. So in 2022/3, Ferrari (the last man standing) will have to supply all of teams, but at least they'll win the championships. Some say F1 needs Ferrari. In my view Ferrari need F1 more.
Sadly, with the wider move towards EV powertrains, the relevance of F1 will continue to diminish. I would actually like to see F1 move towards an alternative to battery technologies, e.g. Hydrogen. This would open up a world of opportunities. Replicating the present vehicle fleet with battery based EVs is not the way forward for personal mobility on a global basis.