Earlier quoted context omitted.
After the sell-off, there’s a lot of cash (yes even more) washing around right? It has to go somewhere , and so it will come back into securities in probably a few weeks or max, months. The value represented isn’t exactly disappearing it’s still in the ‘system’. So why is a crash in equities prices such a big deal?
Money isn't conserved in the same way that matter is. Right now the market cap of gamestop is $22B, which is calculated by multiplying the share price times the number of outstanding shares. If some news comes out over the weekend that causes people to value the stock lower, we could see the first trade at $33/share instead of $330/share. $20B of money just disappears. It never really existed in the first place.
In this scenario both the short funds and the retail investors are fucked. A select few retail investors and some of the momentum-trading quants do well. But the majority of the money on either side just evaporates - rapidly.
In a more distant but plausible scenario, this hits a bunch of funds across a bunch of tickers, and it goes systemic. They liquidate their longs trying to survive, and when it's not enough it rolls up into their brokers who are left holding the bag.