Not really. When you pay for .us domain you have it for a certain number of years. If the US tried to suddenly yank those back and violate the outstanding contracts for x number of years, there would most likely be lawsuits and an injunction from a federal judge blocking the action until there are hearings, etc. It would be a whole thing. If you simply couldn't renew your .us domain anymore, that's something you would know ahead of time and could plan for. It wouldn't just vanish one day.
Not really. When you pay for .us domain you have it for a certain number of years. If the US tried to suddenly yank those back and violate the outstanding contracts for x number of years, there would most likely be lawsuits and an injunction from a federal judge blocking the action until there are hearings, etc. It would be a whole thing. If you simply couldn't renew your .us domain anymore, that's something you would know ahead of time and could plan for. It wouldn't just vanish one day.