The other thing to keep in mind is that tech has attracted a lot of people in it just for the crazy money that FAANGs pay, despite that not being representative of the industry as a whole. Regardless, as that crazy money exits there will be less of those people.
At the end of the day worry without preparation is pointless. I don't think it's a tech apocalypse, but I also work for a company that was formed in the wake of the dotcom crash. Crashes can cause problems for incumbents, but it also provides opportunity for others.