I did not understand the part about My nick name.
You don't know? Aliens invented BTC!

This is all hypotetically. If something bad happen, I'm sure that the crisis will highly pronounced because tether, it's a simple math about demand and supply.
He didn't said that you should look into your nickname but rather look at his nickname and that's what he will do. In short, he will hold bitcoin since his nickname is bitcoinhodler. Also I don't think that many people would trade bitcoin for tether, they would rather trade it into real US Dollars than a copy of it just in the name. Therefore, there would be no crisis but I would rather call it as another bitcoin price dump if people were to trade their bitcoin for USD.