Isn't diversity valued over consistency? I am not a player that requires formal saber fights, but I respect those people, and neither I speak for players whose daily routine was to disrupt dueling players, but, for me, the "random fun" that the duel gamemode sometimes had is all but disappearing. The gamemode had the feel of the "free for all" mode in Jedi Academy, and when wild random deathmatches appeared, it was a gamemode on its own. You have several "levels" of authenticity for the normal gametype, so why not have several levels of "formality" for the duel gamemode? With some minor tweaks, a "force battle" gamemode could be easily born.
Please also consider that public servers aren't the only way people enjoy this mod. Me and my friends enjoy playing over Evolve on a local server, and this change breaks consistency, not enforces it, in a case like this. Giving more freedom to server owners is not necessarily a bad thing. Over time, the community decides whether a certain server is good or not.