They'll purge it all, it will be a ghost of what it once was (if it comes back at all).
Look for them to start shipping the letters out in a few months to the people (they can trace) that had files of "dubious" origins uploaded.
Must make a statement in "the war against piracy".
R**idshare and the likes will start policing more heavily, other sites may become "members only" and "fade into the background".
They can fight the war, but...like they say, "where there's a will, there's a way", and they will always find a way.