I don't think there are many MMOs out there that have as many simultaneous players with this level of graphics. The other contemporary example I can think of is Planetside 2. In that game's zergs you cannot hit 60 fps with high/ultra settings, especially with stock CPU clocks. Same applies here.
I think it's normal to be at 30 fps in zergs. Optimized? No way. But normal? Yes. If you're getting a solid 60 fps in solo/small-group PvE, then I think Anet's met their original goal. That would've been stupid of them to proclaim 60 fps in zergs.
Edit: I wouldn't be surprised if Anet's PCs are playing this game at 720p, 30fps, medium settings. They seem like pretty chill people who don't go for broke with graphic fidelity.
Edit2: Kos with a stock 2500K. Tsk tsk, revoke his officer label.
Point is, that no matter what, the game just cannot utilize the hardware. Be it an old i3 or the latest haswell i7, it will always use like half it's processing power. (of course the i7 will have better frames, but still it wont be running with max usage)
It's like the game/engine is capped/"bottlenecked" to use no more then 50% of cpu and gpu, no mater what settings we use.
Also, I found a video from a year ago, of some guy on youtube trying out GW2 on both i5 3570k and FX 8350. It wasn't a good comparison at all (with different settings, and he had 4 of his FX cores parked), but he did showed the CPU usage, and for both CPUs it was just bad...
http://www.youtube.com/watch?v=a8_dh4b0jL8
What can be seen from the video above, a year later, can also be seen on all of our screens. (talking about cpu usage)
As for the Living Story theories, as much as I like the GW lore, I can't really theorize how the the current story arc will end. But I did noticed few things, that I haven't see people using in their speculations.
On Scarlet's console there is a close shot of ascalonian-desert border, and 3 energy probes marked just next to the the Kralkatorrik's domain(former Glint's Lair) in Crystal Desert. I don't recall any energy probes that are so close to a Elder Dragon. Not in Maguuma(at least not too far to the west), not in the Far Shiverpeak, but there are 3 in the Crystal Desert... kinda suspicious.
Also, again on her console, the Endless Ocean's waters are painted in dark, which looks like a lava or magma to me...