The poll says ~140M would migrate to the US if they could. That’s very different from saying 140M people would show up at our doorstep if we opened borders. It also says that 1/6 of Americans would leave if they could. You are ignoring these important qualifiers.

Edit: it’s actually 158M who would migrate to the US if they could, and ~55M Americans who would leave, for a total net inflow of 103M, if everyone could magically teleport to a new country on a one time basis.

If we just threw open the flood gates sure, but that's far from the only option. Simply increasing the immigration quotas gradually year-over-year would eventually allow an equilibrium to be reached without creating a large shock to the economy.

And I bet the imported values would be exactly the same as the ones held by the current citizens.

I bet the food would be delicious.

And so free of pathogens.