Edit to add: And the point you make about the cost of parts/components/materials also plays an important role for these manufacturing companies. Maybe they'll be able to source their components from some company in the US, but at a much higher price... which of course trickles down to the consumer. Chances are they'll just continue to buy their products from China because it will still be cheaper.
The bottom line is, everyone will feel the pain of Trump economics. From the raw material supplier, to the component manufacturer, to the shipper, to the end product manufacturer, to the store, to the consumer. All the way down the line.