I think the issue will be in identifying who qualifies as a patent troll. Of course we know but what is a legal definition that would suffice and encompass all the companies that acts as trolls?
A comment above addresses this well: shell companies, which is really the problem we should be fixing. Granted, the definition is probably still difficult to legally define despite how obvious it is when you're looking at one.
I'm sure Google and Apple and the other large companies fall into this category. I'm not sure I qualify them as trolls. Neither would the number of patents held by those companies qualify them either.