A few days ago I noticed that I lost half the traffic for my website overnight. Investigation showed that someone had made a perfect clone of my website (more info here), and that Google in its infinite wisdom had decided that my site is no longer relevant and replaced my site with the clone site on the first page of its search results!
I filed a DCMA complaint, and the offending site was delisted from search results a few days later.
However, I'm no longer on the front page of Google. In fact, for my main keywords, my main site is no longer in the search results at all. One of my "long tail" pages shows up on the 2nd or 3rd page, but the main homepage no longer shows up.
Will this be resolved in time, or is there something else I need to do about it?
EDIT: In response to the query of "maybe you just lost ranking for some other reason": I figured out that the clone is implemented as a a proxy so I can see its traffic as well. My site's traffic dropped the exact same day the clone started getting traffic, i.e. when it started showing up in Google's search results.
The question of "Why was this site even listed by Google" is a very valid question, and it would seem that Google is not so clever as they say they are, but that seems off-topic. At the moment I'm just trying to get my old position back.