Going by your logic, EU will have to build their own Coca Cola, Pepsi, Facebook, Google, and what not.

And China or India is not going to buy any of your products. Is this how you want it to be?

Globalization predicates that capital and goods are procured from places where they are readily available. It is what the post-WWII world was built on. Global trade may break apart to some extant due to the nationalism resurge, but economies of scale is real and smart businesses will leverage that.