More ambitious teams on the grid is always good, and a proper American team (sorry Haas) will lead to more engagement in the US which should help growth. I know the Americanization of the sport is a controversial topic and I too am dreading the Las Vegas GP (though the spectacle will probably be great the track looks dreadful for racing), but I think capturing the American market will be important for the big teams to stay committed to the sport. It would also just be exciting to have more than 20 cars on the grid again.
Now we just need to get rid of Alpha Tauri, though sadly the sale doesn't seem to be happening.