No Offense but Open world PvP is like real life. Sadly it is a fact of life that the side with the bigger army is always going to win. If people dont recognize this fact, theyll start yelling for balance, but the solutions will tend to imbalance in the other direction.
The only really viable solution for Illum is to make it like Alterac Valley was when it first came out. Not the retarded foot face it is today, but the constant back and forth struggle that truly felt like one was in a big warzone.