I wonder if an argument could be made that over time, investors learn their lesson.
Like, if the tech darlings were like the dot com faves of 20 years ago, would the masses be diving in or would they recognize the danger and proceed with caution? I feel like there has been quite a bit of learning that might allow the market to detour without crashing to the bottom.
But if a financial crisis comes out of nowhere, where no one is looking at credit default swaps and Lehman goes down, and then you have big companies teetering on the brink of bankruptcy, yeah, that I expect will deliver a huge blow. But how likely is it that we have another of those? And how affected would today's darlings be? The tech companies and online business/sales somewhat insulates them from things that previously would've rocked them. A pandemic that forced people to stay home resulted in record profits for tech. Go figure. If you can do business from anywhere irrespective of what's going on in the world, you're kinda golden.
The only obstacle would be people not having enough money to buy your products. And automation that is causing people to slowly get phased out of work might be the biggest risk in that regard.