I don't know about a decade... the dotcom bubble bursting was pretty close to normal within 5 years or so. Still a long time, and from personal experience the 50% pay cut from before and a year later was anything but fun.
The market as a whole always recovers. But individual companies, or even entire industries can vanish without a trace. So betting on the entire market is a fairly safe bet, long-term. Betting on OpenAI is much more risky.