If patent trolls get too greedy, they may undo themselves.
Seems to me that if someone were serious about promoting patent reform, they would become a patent troll to undeniably drive the point home. I used to be upset at patent trolls, but now that I've thought about it the problem has never been the people who choose to most obviously abuse the patent system, but rather that the patent system is designed so that such abuse is possible. The real damage is caused not by the patent trolls, but by productive corporations who's random assortment of obvious patents will be used to sue any competitors into oblivion, thus discouraging anyone from even trying.
The real mark of the brokenness of our patent system is not patent trolls, but rather that most engineers are forbidden from looking at patents.