I don't know if they think it is the "end of the world," but they do seem to treat it as a personal vendetta of tennis and world governments on Novak. Somehow, things get conflated, but there are two things: one is that nations have their laws and policies about entry regulations for foreign nationals. The current covid ones are what they are, and I agree that the US is unlikely to make a change until into 2023. Mostly just because how government works. They have no especial incentive, and they have bigger fish to fry. This is the important, and immutable one, as we saw in Australia. Border guards just don't give a rat's ass about who you are, or what might be going on in the tennis calendar. The second one is what individual tennis associations and what players associations can do, or mandate. The USTA, or the USOpen could have its own covid policy, though it won't, as far as I can tell. NYC has related policies, so it's unlikely to be more strict, so if you're in the country legally, you're in the USO. But this is what everyone forgets about the AO: just because the state of Victoria and the AO decided to accept Novak's medical exemption, it didn't mean that the federal government of Australia had to. Obviously it got all crazy and political, but people need to understand there are a couple of different layers, and they are very separate.