Manufactered in China, but designed and prototyped in the US. Which would you rather have your kids doing?
I'd prefer my kids be proficient with power tools, computers and pen & paper, all of them are necessary.
In case I misunderstood, I agree that losing the classes you mention could very well mean losing our edge in design and invention but losing spec work to factories in China is not a very good argument to keep those classes.
Millions of Chinese students have or will have done engineering and science at the degree level, that combined with the Chinese business acumen will almost certainly ensure them both designing and building the things we require in the future.
The USA will however have plenty of patent lawyers to ensure they are all sued if they try to get too clever.