This is a FANTASTIC addition. Well done Warmane staff. Adding in a PVP server will absolutely vitalize the arena ladders and BG queues.
If you're against this, be realistic with yourself. How often are you going to be playing arena? If you're playing just to cap points and potentially get a weapon (most of you vocal minority), then this change does NOT matter for you. At all.
A trinket isn't going to make the difference between you being a 1700 hard capped player and a 2200+ player. I promise you. The amount of dual-glaive rogues that were hard stuck 1700 in classic TBC in s3 was laughable.
This change will bring hundreds of players into the server that wouldn't have previously played. The rank 1 gladiators will play on Blackrock, get their gear, and be 1k mmr above you and you'll never see them. The sample size of where you'll actually be affected, and it'll actually matter and make a difference in a single arena match, is basically 0.
Great idea, Warmane. Thanks for doing this.