The trick to getting on with business is to run a business that makes your customers happy. Unfortunately, these telemarketing businesses never realized that. Now they will. Just like limiting the strip club in your neighborhood with city codes (such as recently involved in LA), the people want limit the telemarketing industry. Fair is Fair
It's worst for someone who works in a two or three state area, like Philly or Washington. They have to deal with not only the state DNC lists, but also the Federal list, and it means for many of them that they must in effect share their personal lists with the clearing houses, which will doubtless then distribute them indirectly to all the big boys.
There are better ways to go, but it's such dumb knee jerk reaction thing that no one will notice it's really not a good idea.
For myself, I am looking forward to picking up all the lists at a fraction of the cost one would normally pay for them. I can handle millions of records no sweat while most people I know can't. Thank the government for me, won't you?