Even if the patents are only valid in China, this is going to hurt western companies a lot. If you're manufacturing a product in China, you'll need to either:
1. Pay the patent trolls, giving them power and hurting your margins
2. Move manufacturing to a more expensive, less competitive country
In the long run, you could argue that point 2 will lead to domestic manufacturing which everyone wants. But unless you can find a way to make these companies actually competitive (e.g. tariffs on chinese printers), I think the more likely scenario is these hamstrung companies will wither and go out of business.
1. Pay the patent trolls, giving them power and hurting your margins
2. Move manufacturing to a more expensive, less competitive country
In the long run, you could argue that point 2 will lead to domestic manufacturing which everyone wants. But unless you can find a way to make these companies actually competitive (e.g. tariffs on chinese printers), I think the more likely scenario is these hamstrung companies will wither and go out of business.