zehrila - 10:46 am on Oct 19, 2012 (gmt 0)

Have Faith, they will go down, atleast 80% of them, then they will be replaced by other spammy sites, then they will go down as well and the pruning process continues.

When Google has sufficient data on these sites, they will be treated how they need to be. The 20% of those which won't be affected regardless of how spammy their backlink profile is mainly because of the kind of browsing experience they provide to their users, if their users are happy and trust them, they will stay.