Major tournaments would probably have to be sanctioned by FIDE, and many people are not enthralled with that organization.
Most likely they wouldn't be sanctioned by FIDE. Doesn't an event in such cases have to be held by a FIDE member, i.e. like the USCF?
I think we'd have to fore go FIDE ratings until a national organization asserted itself.
Why cant states use an elo rating program and keep track themselves of the ratings for registered players in their own states and just cut USCF out completely ?
There's nothing that stops the state organizations from doing that if they have the resources. However, I don't think that that most state organizations have the resources, and they are happy to let the USCF perform the service. Additionally, there would have to be coordination between the states, and eventually, a USCF type organization would evolve.
Major tournaments would probably have to be sanctioned by FIDE, and many people are not enthralled with that organization.