Game exploitation is something else entirely. But for the most part, you are playing a fair game. Faction imbalance happens for a reason btw, and is a direct result of what I said earlier. The good players like to band together for the most part, because the system in place leaves no alternatives.
Yes your idea would help with the issue, but it doesn't fix it, and Bioware would never kick players out of a WZ based on their 'performance'. You would still get skill imbalances because of no ranking system and players would still leave because of this.