I think people are overestimating how many people there are on their server in their own faction. Also the fact that there aren´t really any rewards. The first 3 days this will be a cluster, after that it won´t be too bad. On most servers, after the first week there probably won´t be anyone in there.
I do think the kiting will be an issue though, and I can really see certain groups having ´contests´ to see who can prolong a fight the longest... it will be like a challenge mode heroic in reverse.
Also, I believe there are items that watchers can buy and throw at the contestant. it could be that these are meant to prevent people from kiting a match.. maybe a mvmt debuff or soemthing.