Laguna Seca or GO HOME, F1.
I think it might be too small/short of a track. Even for MotoGP, they never really get up to speed anyplace.
We really have no good racetracks in this country for F1 as they stand now. Lots of great road courses, esp for sports car (ALMS/Rolex), and of course all the banked ovals for stock cars.
With massive improvements, I could see someplace like Sears Point or Watkins Glen hosting a race. Road America might be great, but I don’t know that their facilities can handle that kind of race in terms of lodging (for example).