I never said all-in Tether. Also you cant "cash out" a billion dollar of anything. Its completely absurd, no one has a bank account with a billion dollar on it. It also make zero sense to ever do that. Its completely irrelevant if that is or isn't possible with coin XY if there is nothing you could move it into. The only reason someone would cash out a billion is if he wants to invest it into something. What could this possibly be that requires a instant investment of the whole billion? You guys need a reality check. No one ever buys something with 1 billion at once. There are multi-billion contracts but they aren't settled at once.

You could probably sell one billion in Tether over the course of a few month just fine. Simply stop selling if the price goes below 1 USD and use all large exchanges parallel. It has several billion fake volume so even if real volume is 100 times lower it should suck up an additional billion. Assuming real volume is 100 times lower and you sell over the course of 100 days you would only cause less then 1% of the volume.