I don't think that we will ever get rid of Spam, its like herpies, its bad but its not going to stop people from having sex, just like Spam isn't going to stop people from using email.
I think that increasing the punishment for Spam will stop some but not all, people will do _anything_ for money. I don't think that fining the zombie computer owner is a good idea, but the whole idea of disconnecting it from the Internet until it has been fix is a great idea, but i highly doubt that the normal mum and dad computer user would like there Internet taken away from them for something they didn't do.
As punishing there family members i don't think is the right idea, i mean i wouldn't like it one day the cops show up and take my computer and stuff because my brother sent Spam emails.