Interesting. But I'm not sure the fall is for the reason's you suggest. It's probably more to do with frigging figures.
Every software house knows that people are going to pirate their wares. They don't care though. They know there are always going to be people who will buy it legit and people who won't.
I'm not a designer, but I always have some version of PS. Adobe know people do this, but they also know that if it wasn't really easy to get a hooky copy then people wouldn't ask their boss to buy it in a business environment.
Further to that, there's loads of software that people have who are never actually potential customers. The software that I like to use to record music on costs several grand. They haven't lost a customer, because I would simply never buy it in the first place! I'd just do without or use something that was open source....