If (or when) Binance will go down, another exchange (or, hopefully a DEX this time, although I doubt is) will rise and take the lead. It has happened before. Many even thought that FTX will replace Binance, heh.
Plus, "crypto" will probably get a well deserved blow, since most projects' reason to exist is just to suck up money. Although many will just switch to Bitcoin intead of Tether, for example.

Actually, without Tether the system (the prices!) could become clearer and more honest, since Tether is, let's be honest, overly inflated.

I don't know why people keep relying on centralized stuff no matter how hugely disappointing that is...