Unless Bitfinex goes offline when the next breakout begins. Then you will be stuck with fiat. These unregulated exchanges tend to do that during panics.
You're assuming most of my fiat is in an exchange. That would be reckless.
Of course not. I am saying you will be excluded from purchasing bitcoins until the panic buying ended at a much higher price, unless of course you already have a contractual agreement to make OTC purchases.