The problem with going after knife counterfeiters is that most of them come from over seas and China specifically. Good luck winning a trademark or patent case in China..... I see your point but the situation is more complex. Let's take a look at the Spyderco PM2 as an example. It is one of the most counterfeited knives coming out of China. Also, it is one of Spyderco's best selling models, so much so they cannot keep up with production, or keep stock on dealers shelves. So to avoid the counterfeiting should spyderco abandon the design or spend more time innovating it? I tend to think no since they can clearly keep making money on it.
I agree about China, but again, knives are small potatoes compared to the entertainment and luxury goods counterfeits coming out of there. (Not that it feels like "small potatoes" to those infringed upon.)
If Spyderco can sell those things as fast as they can make them, then I guess they just keep on keeping on. But at some point, sales will slacken, and when they do, I would hope that the company has sufficient new & better models queued up in the production pipeline, ready to go. That's just basic business sense.
As for patent and trademark protection, the benefits go in two directions, alternately. First, it gives innovators a period of time in which they can develop and sell (or licence) a product or feature for their exclusive benefit. The second stage, which involves
society's interest, emerges when the protected period expires. Then its to everyone's benefit that is, for society as a whole that the innovator's exclusivity disappears, and the design becomes generally available for all to copy without paying fees or royalties.
The fight isn't over patent protection so much as over
how long that protection lasts. I'm in favor of a strong law protecting innovators but the period should last less than the current US term of 20 years (for utility patents) and 15 years (design patents). I'd cut those to 10 years and 5 years respectively, but I'd be willing to listen to arguments to the contrary.
In any case, the basic message to makers is: keep running as fast as you can, because the big boulder rolling downhill is right behind you.