This is due more to people not understanding what the patent covers. The right response in my view is to educate people. Just because someone has a patent on a particular variation of X, doesn't mean that working on X is risky or what not. Just don't infringe their variation. When I was at the USPTO, I examined a lot of little variations of common things in my area (water heaters and car air vents, mostly) and I never worried that it would stop innovation as usually the point of novelty was not particularly groundbreaking, or even necessarily of interest to anyone aside from the applicant.