The flip side of this is that even if we decide to no longer issue software patents today, we still have 20 years of software patent lawsuits (I'm assuming that

The flip side of this is that even if we decide to no longer issue software patents today, we still have 20 years of software patent lawsuits (I'm assuming that invalidating all current software patents would be too difficult), and so methods for mitigating the harm that comes from software patent trolling are welcome.