When did anyone request more regicide? Especially team regicide?
I have been on the forums ever since the release and have seen nothing but requests for Team Doubles. I also made such a post.
So why no Doubles?
Because 343i made a gametype and they want to feel special.
Bungie made new gametypes for Reach (Stockpile, Headhunter) but realized that nobody really enjoyed them and so they were removed from most playlists.
343i are too vain to remove the -Yoink- gametype.