On the upside, you can scarcely breath without infringing a patent these days. I doubt a patent troll can operate in a non-infringing manner should a sufficiently large portion of the patent-holding community decide to get pissed off at it.

Problem is that the trolls also have few or no assets, other than their portfolios, that is.

There are exceptions, and as you might guess they tend to be interpreted quite broadly. ;)