There is no other solution than ilvl. If you take a look at parties before bg begins, you will see a significant number of greeners. My recently bgs in 10 member parties had 4-5 greeners.
And people wondering why they loose. Greener = 0 damage to grevious set (no need to mention about pridefull). Their actions is mostly annoying than do anything else to the enemy.
The full contender's set if in mot mistaken, it starts from 400 ilvl. If that ever been implemented, all greeners are out of bg untill they spend some gold (most of them has hundreds of thousands) and get basic pvp set.
Ilvl restrictions will keep all the worthless greeners out of bgs untill they invest in proper eq and in time get better sets. That called linear advancement.
And another point that nobody mentioned before. In several bgs i saw totaly naked toons to walk around without doing anything. I thing that was allies spies to infiltrate to horde bg queues and getting easiest wins.
Ilvl solve that too.
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If you look closely the facts you will see in many bgs, horde has no healers at all, and in top of that, greeners is the problem again which leads to much inferior dps.