No! Please, please don't make this change. Different guilds already choose where they want to be-- think of the old BG guilds that transferred down to FA or another lower tiers because of the better fights. This will also make coordination so much more difficult. Think of the float tags that are put together on the server's TS channels. You won't have guilds willing to tag with randoms using their own TS channels-- instead, it'll kill participation in WvW by anyone that isn't in a major guild. If nothing else, keep combining the the smaller servers with bigger ones. WvW is successful because people enjoy the way it is. Make new maps, create new systems for combining servers, but don't kill the server system you have currently.
