The separation between PvE and WvWvW is killing a lot of servers. You have new PvE content coming out roughly every 3-4 weeks, causing many players to focus more on PvE then WvWvW.
This leaves servers with an already low WvW population with even less people and I’ve been experiencing this a lot lately on my server.
Every week more people transfer to the top tiered servers because they are tired of having no population in World vs. World, and that’s a pretty big deal breaker for me.
It’s really a sham there is a such a division between PvE and WvW on some servers, as the population imbalance within WvW is still the biggest issue with WvW in GW2.