There is nothing that I have read on this thread that leads me to believe that litigation against FD would succeed. (I am a practising barrister. I have only skimmed it, because nobody has that much time on their hands, surely?) but people talking about crimes being committed or the prospects of 'class actions' need to just take a deep breath and step away from the internet. Litigation is a process that one goes into as a pig and comes out of as a sausage. By all means claim a refund if you are that offended about the lack of offline play but I would advise that litigation would: a) not lead to an offline mode, b) be expensive, c) be risky and d) not lead to you recovering any more than you have already paid (which in most people's cases is less than £200, or the equivalent of about an hour's worth of a solicitor's time (their fees not being recoverable on claims of this value).
Commander Spook
Commander Spook