I think the new Wurm fight proves and indeed begs that Anet can and should develop instanced raids for GW2. For big servers like Blackgate, Bloodtide coast has essentially stopped existing as an open world PvE map, and become a massive 150-man instanced raid, albeit with primitive organizational tools.
Think about that for a moment. Bloodtide Coast has become a raid with a 2 hour lockout, as opposed to other MMOs having 1 week lockouts, etc. Take that concept and refine it in your mind. Make it more manageable by the community; basically make the cap smaller (maybe 50 people?) and set it up so that it uses a large party system (evolve the commander/squad system?) instead of the current system of people “ferrying” others into the hardcapped map.
Take what Bloodtide Coast has become, refine it, put it in an instance like a dungeon which can accommodate multiple groups in different instances that are under your control rather than the hardcap limit of the open world map, etc. Anet could do this, the pieces are all there. I think it would please a lot of people, both the raiders and the non-raiders, because it would mean alleviating the congestion of open world maps while simultaneously giving raiders more control over organization.
Devs? Players? Thoughts?