This also demonstrates a lack of basic comprehension. If a user is swapping their BTC for a coin on another blockchain, that means the user on the other blockchain is accepting the BTC. It is therefore not possible to have a mass "exit" from BTC if it's 1 out, 1 in. Someone will always be taking the place of the person who left.
Come on, you're handing this to franky1 on a platter. Someone always buys bitcoins sold anywhere. But that doesn't make it impossible to have more people exiting than coming in, or create price pressure, etc.