If you think layoffs were bad the last few years then just wait until the costs for all the ai hardware, massively overpriced talent, and acquisitions hit the books for these companies. It's going to be a bloodbath.
Given the wage difference ... what does it matter? You make 200%-300% after tax in the US what you make in high cost areas of Europe (despite that the pre-tax difference is closer to 75% to maybe 125%). Normal US pay is comparable to tax-haven pay elsewhere: Europe (London, Luxembourg), Middle East (UAE), Asia (Singapore).
So in "a few years" (let's say 2-3 years) you'd be able to make between 5 and 10 years' worth of European net pay. If you don't raise your spending, that will easily cover your living expenses during the next recession, even if you spend all of it unemployed.
And that's if you start now. If you've been doing this for 10 years already ... wow.
Without getting into the differences about the benefits you get in many European countries compared to the US, I think it's pretty naive to think you could realistically save enough from a salary alone to live for an extended period of time (something like 1-2+ years) in the US simply because the net salary is higher. Expenses are high, and when you become unemployed they become higher (e.g. you have to pay out of pocket for your health insurance, either from the ACA exchanges or from COBRA), and if you end up having an unexpected expense it could cause a lot of issues since you don't have a regular stream of money coming in. If you're lucky it could be okay, but it's luck dependent.
Besides that, if we assume AI will take many jobs in the coming years, what are you to do if you suddenly become unemployable with your current skill set and need to, for example, go back to school, or find an entry level job in another field with a potentially significantly lower salary? Live off of your savings?
