I been watching the Monster Energy Super Cross from the States, with no crowds.
Must say I got used to the lack of crowd noise pretty quickly, and one only sees the empty stands every now and then. Seems like the camera crews have been asked to avoid covering empty stands too much. So like everything else, it's an adjustment, but not the most difficult thing we've had to adjust to during these very strange times. I am also sure that the MotoGP organization will make sure we have a splendid viewing experience.
However, also a fan of MMA, and watching that without the noise from the crowd is a real eye opener. You can literally hear every smack, grunt, groan, the fighters talking to each other (sometimes quite amicably) and even recently Anthony Smith picking up his teeth and asking the ref to hold them for him.