Drysc assures us that even the low-population realms will get the phases auto-completed for them eventually if they don't have the manpower to get there fast enough on their own. What if you want to see exactly how the realms stack up? We talked last week about a manually maintained forum post; however, that has problems with trustworthiness and the difficulty of keeping it updated.
Edur, of Gorgonnash-A (EU), has created a web site that relies on game data form participants to rank the realms according to their completion of the Sunwell questline, and a very nice site it is. You can see all the US and European realms and where they stand both on the main phase quests and on the side accomplishments, like constructing the portal from Shattrath to Quel'Danas. There are also nice progress charts for each individual realm, and, most usefully, ETAs for when the objectives might be reached given current rates of completion.