I was thinking the exact thing Pocket. They need to offer new rewards each "season" or offer new things to collect. We are going to see a huge influx of players but they will all go away 2+ months down the line.
I have mixed feelings. I'm happy that we get ascended gear and a legendary backpack. But I would like some actual WvW changes that matter. Unless we do this could be like PvP: season 5 - loads of ppl show up, season 6 - graveyard.