The point being there is a lot of evidence that shows, making content that relies on players is a terrible idea. No MMORPG has been able to solved that problem, as of yet because it is extremely difficult without cutting player’s freedom and choice and that leads to another array of problem. Your WvW example shows a complete lack of understanding about the issue of what is going on.
All the evidence points to is that it hasn’t been done right yet. If you look at a failed execution as proof that the concept is flawed, well… Let’s just say that I’m glad you’re not in charge of designing anything. That’s just not how it works.
There are ways to solve problems without throwing up your hands and saying, “well, it doesn’t work, obviously the idea is stupid.” 3 way PvP has been proven to work in Dark Ages of Camelot, for example. So why doesn’t it work here?