I honestly don't even think the people who came up with this are thinking about that. Like nifty said, these policies will create a brain drain that will be bad for the U.S. economy, including the assets of the rich.
This is just some christofacist shit. I don't think they gave a thought to anything else.
I apologize in advance for sounding like a dick here, reducing people to dollars and cents. But that's how the people we're discussing see us.
It's not the ones who don't have 5k and/or marketable skills that would harm the economy by leaving. If you've got something to offer and a company to sponsor you immigration is relatively easy. I've spent part of my career working in other countries, and I've known many others that have as well. What we have in common is we're all educated professionals with lots of disposable income. We would harm the economy if we left in larger numbers and stayed away en masse. Although some stay, for the most part we come home. It's nice to go home. If it's not nice to come home, we'll take our education and skills and stay somewhere that is nice. That's why it's called a brain drain and not a ditchdigger drain.
And then there are refugees. Countries don't take refugees because they want them. They do it because it would be inhumane to not at least have a process, even if many countries make the process as onerous as they can.