While I support anti-spam legislation, I think technical solutions will improve to the point where people lose interest in legal solutions. Do not imagine that techniques like address obfuscation and content filtering have no effect on spammers. One spammer recently complained "My operating costs have gone up 1000% this year" trying to get defeat anti-spam efforts.
Once everyone is using good, adaptive technology to eradicate spam automatically, spam will cease to be a worthwhile business. Already, spamhouses tell their customers that they can reliably deliver only to 50% of the addresses on their list. That number will continue to shrink. Because nobody is willing to wait for politicians to figure out what to do about the problem.