Increasing Gladiator and Rank 1 spots will not make the average or casual World of Warcraft player think “Wow, it is finally time to engage in rated PvP because we have more Gladiator spots!”, this caters mostly towards a small minority consisting of:
Streamers, like OP, who need this game to be somewhat active in order to justify spending time to stream and playing the game
Boosters, RMT enjoyers spending money to buy rating or title spots, which the game is infested by already as a lot of arena streamers offer these paid services
Players who spent years of playing the same old expansion on private servers waiting for their time to shine and “compete” for a top ladder finish
However the amount of players in this pool is incredibly small, the average player simply does not fit into this pool and will probably never do.
So to help these players step into rated Pvp there need to be other changes than slapping Gladiator and Rank 1 titles back into 2vs2 and 5vs5 brackets.
Changes to give casual and average players something achievable to grind and work for like also awarding other titles such as Duelist or Rival with a seasonal mount or other incentives to make them feel valuable.
Lower the rating requirements across the board from 2200 to something like 1800 or 1600 because again even this rating is far from where an average or casual player will end up.
Besides casual and average players leaving Cataclysm Classic arena scene multiple streamers as well as their audience and other players who would usually be competing for Gladiator or Rank 1 spots quit the game not because only 3vs3 was awarding titles but simply due to the gameplay not being enjoyable. The game itself is the problem here.
If crossfaction arena queues get implemented Blizzard has to apply additional balance changes to racials unless they want to allow every racial abilitiy to be mixed together wildly which might cause balancing issues and has to be accounted for in advance.
For the game to be attractive again for the average player we should not exclusively listen to the thoughts of streamers or hardcore arena players as many of them will play the game regardless.
Lastly rated Pvp needs to be less destructive and a less disheartening experience for first time players or new players trying to engage into it.
The best way to do this would be establishing a Solo Shuffle like game mode so average players do not have to deal with toxic ego players when trying to find team mates and being flamed or insulted or dropped after losing one game.
Make Pvp easily accessible for everyone, let players walk up to an NPC or use the Pvp tab and engage in rated 3vs3, or 2vs2, or 5vs5, whatever seems appropriate, immediately after coming home from work.
Therefore after introducing this Solo Shuffle style game mode into MoP it should also include Gladiator as well as Rank 1 Pvp titles with mounts in addition to other rewards so players can progress at their own pace.
Most modern competitive Pvp games offer a game mode like this and it is the game mode with the widest success.
Solo Shuffle also directly combats boosting and RMT, which were a very big issue in the high Duelist, Gladiator and Rank 1 range throughout all Classic arena iterations, as doing these things in a Solo randomly matched environment is not entirely impossible but way harder to execute and also very easy to identify.
And sorry to break it down to you but OP cares little about you or anyone else here, his life and job are at risk so he is trying the best he can to salvage it now as most of these issues were present throughout TBC Classic until now but “streamer feedback” was mostly given to developers through private discords and not discussed in public. You can find similar feedback posts like this one scattered in the forums over the last few years with little effect.