As longs as we're speculating.. One of the few things I can think of that can't reasonably be sped up is data integrity recovery. Say some data got in an inconsistent state and now they have to manually restore a whole bunch of financial transactions or something before opening the game up again, because otherwise customers would get very mad at missing stuff they've paid for, traded, etc.

If they were to resume the game before restoring these issues, they would only exacerbate with state moving even further from where it was originally.