While there is and always will be a "strength in numbers", i see that most RvR/AvA rulesets just encurage the "mindless" zerg.
As long as just running/staying with the zerg gives the best reward (capture exp/lootbags/realmpoints) for minimal risk, people will stay with the zerg.
As long as defending and fighting itself gives less rewards then capturing points, enemy-zergs will sometimes be evaded for fighting is "wasted" time, better used to take over undefended keeps/points.
ESO will need a reward-system that actually encurages fighting/defending and discurages taking over undefended keeps with large amounts of players.
When running with the "mindless zerg" gives better rewards then taking risks, players will stick to that behavior.
The big problem i see is encouraging massive warfare (large scale battles) while discouraging the "mindless" zerg circling through keeps at the same time

While in most RvR-Rulessets there are a lot of loopholes and problems, the biggest 2 encouraging "mindless" zergs are the following:
1. best rewards for "capturing"
2. almost no rewards for "defending"
We need systems to balance risk/reward a lot better, so capturing an undefended keep with 200+ Players gives minimal rewards, for there was minimal risk!!
Encouraging defending Keeps/Points is a tough one as long as capturing brings good rewards.
Raising a call to arms for defense are ignored most of the time, for running the the zerg and RE-TAKING the keep 5 minutes later gives better reward with no risk at all!! So why wasting time with defense?
Any Ideas to help making AvA in ESO long term fun with good and large scale battles without ending up in 3 zergs running in circles taking keep after keep without actually "fighting" each other?