The field would become more attractive to Americans and they would fill the empty places.
Except the whole "software eating the world" thing that might be the exception that proves the rule.
That may be, but I'm not sure you know what the words "normal" "healthy" or "proper" mean.
The only reason prices are so low is because it's all outsourced. If you want Americans to do the work of the SEA and China, then you're going to pay a lot more for your shit. Those low prices are the only thing that a lot of people rely on their livelihood for.