Remove the rating requirement for gladiator mount and the enchant, leaving the gladiator title as the gladiator reward. Instead of having a rating requirement, change it to requiring 500 wins in 2s or 3s for enchant and 1000 wins for mount. By doing this, you make it achievable by many players including mount collectors and enchant collectors.
Doing this would cause 2s and 3s to see a massive influx of players.
That would do nothing. It would actually decentivize players like me. Rewards should mean something.
This ain’t it.
Collectors would just complain that they have to PvP at all.
Right, which is why you get a title.
And as for people that would complain because they need to do pvp, yes there are going to be some, but there will be way more people that play and don’t complain.
Nobody cares about a temporary title. 
Armored dragon is the prize.
No, lol. So, somebody that gets 500 wins at 1k MMR gains the same reward for someone that gets 500 wins at 3k?
Horrendous and lazy idea.
You want more activity? Add more incentives from the bottom up. Make Gladiator percentage based again. Offer a Gladiator ground mount at 2700. Armor addons at 2k, more weapon skins, toys or other feature items. There isn’t an incentive for most people to play after 2400 as it currently stands whether it be RSS or traditional rated arena. Heck, offer a 25k gold bonus for queuing and winning a certain % of your games on a weekly basis. Blizzard needs to overhaul their reward system more than anything.
More participation stuff for healers and <rival rewards would help, I think.
Those are great ideas! Hence the purpose of the post to start a discussion on this topic.
I mean this whole thing is less of an exchange and more of an explanation as to how it won’t happen.