Yes, and the United States cannot shoulder the burden of the entirety of the world's economic migrants.

Where is this magical, commensurate influx of licensed doctors coming from to deal with the influx of unlimited economic migrants (who can't cover their own tax expenses?)

We're not talking about yachts: we're talking about healthcare and food. Take all the yachts away, force Bezos to liquidate everything (and every other billionaire): neither the income nor the fixed assets are enough to cover healthcare for the population we already have, much less a gargantuan, unproductive group of new arrivals.