HugMonster, I agree and empathise 100%.
I have already blocked all mail from the four you mention, have a blacklist with 264,000 domains on and still get inundated, particularly on my work address.
Spammers use so many techniques and can keep registering meaningless domain nomains that it seems impossible for the individual to stem the tide.
I hope, like you, that something will be done, but I aint holding my breath.
SD