Highly unlikely it will last. spammers are used to this sort of thing, they'll be setup elsewhere in no time.
-Ehtyar
I know, it's inevitable. I guess it was just a bit of wishful thinking on my part ...
But eventually it's all about raising the costs for spammers, to make their business less profitable and therefore less attractive. If they're forced to other, and more expensive, hosts, a reduction of spam may be feasible.