Well, if it wasn't plausible, it wouldn't be a very good lie, would it?
Yes, I believe companies can reorg and that can be good thing, there can be painful transitions. I do not think that's what happened in this case (though retail store changes certainly account for a little of it). I'm sure GW sales have never principally been through their direct owned stores, and certainly not outside Europe for the last few years.
The stock went down because the report was bad. The report was bad because they've been screwing up lately....not because of whatever they want to use as an excuse.