GW2 is a PvE game. They don't have to do anything to make it that. But I understand the sentiment.
I agree to an extent, but I am a strong proponent of filling in holes in game systems or adding things that support future updates. One of the "side effects" (really design reasons) for the megaserver is that it allows ANet to be more aggressive with adding zones. Colin explicitly stated this in our interview as one of the goals of the system.
So while it is lacking content, this patch specifically does patch (heh) a few holes that will actually allow for more aggressive expansion of content in the future. Think of it as a foundation for a new wing or something. Hopefully the new season starts off with a bang, taking full advantage of the changes.