I feel like you're about half correct here. For instance, most of these factories aren't "toy factories" they are "injection molding" or "pcb" or "electronic assembly" factories.

I would invite you to submit any examples of how you think modern toys are made of "mostly" standard tooling... that's not how this works. China has more mold designers, mold makers, and mold shops in many towns than other countries have within their borders.

I do agree with you that the old clockwork motor would be too expensive to manufacture now, but I think you should keep thinking about the rest of your thesis.