Most business revenue in America is still from small to medium sized businesses, so this investment you speak of doesn't sound too important. So yes, I agree that business produces wealth, but the business that matters isn't going anywhere because they're largely local. The larger corporations are still going to do business here as well because of the market power.

As for wealth flight, it's overblown. First fleeing to another state is very different than fleeing the country. Second people aren't staying in America only because the taxes are lower, there's plenty more to offer.

Edit: I forgot to add that the actual evidence for wealth flight is pretty thin.

And for those corporations or wealthy people that do leave, fuck 'em. They're not special, irreplaceable snowflakes. They beat out their competitors by luck, and local competitors will immediately spring up to fill the void they leave.