What should Blizzard learn from the new MMO's?

As the topic states, what do you think Blizzard should learn from the new MMO's that have come, or are coming, out? What do you think could be taken from them to improve WoW?

Personally, I think that WoW should take a leaf from Guild Wars 2's book and start adding in more dynamic PVE and PVP content to the game, perhaps in the form of zones focused purely on these things, which are drop in, drop out affairs. Why do I think that this kind of content design would be good in WoW? Simple: the endgame, or, as we're seeing at the moment, the end of an expansion.

When an expansion pack like Cataclysm reaches the end of it's run, we're left with a content void that lasts for months, if not, indeed, the better part of a year, as was the case with the transition from Wrath to Cataclysm. This drought of content causes people to rapidly burn out after they've gotten the last tier of raiding on farm status, or gotten that last bit of arena rating they need for an armour set, and whilst the dev team is trying to up the pace of production for expansion packs, we're still left with that huge void of fresh content that sucks up our friends and guildmates.

With more dynamic, player driven content in the game there would be a lot more to do at the level cap instead of just raiding or running arenas and rated BG's and, better still, there would be far less of a chance to burn yourself out. After all, if you have a wider choice of content to play through as you please, rather than a single raid with three difficulty levels, you'll grow tired of it far less quickly.

So, what do you guys think that Blizzard should learn from the new boys on the block?