Why? It's not even popular and many people are sick and tired of it. Why does Hexakill get priority over other game modes that more people actually like? Once a month, sure whatever. But it appears on the RGM at least 4x as often as other game modes. If Riot loves Hexakill so much, swap to SR instead of the same boring game mode every other week.
Zielmann4 votesHexakill on SR blows. They tried it once, and I don't think they ever went back to it. Honestly, I think it's one of the better featured modes. I'm happy to see it show up fairly often. And I'd be willing to guess that it sees enough play when it's out to support bringing it out more often than some of the others.
BakedLotion1 votesHexakill on SR blows. They tried it once, and I don't think they ever went back to it. Honestly, I think it's one of the better featured modes. I'm happy to see it show up fairly often. And I'd be willing to guess that it sees enough play when it's out to support bringing it out more often than some of the others.
The queue times speak for itself. They're MUCH longer than any other game mode except Def not dominion. OFA/URF/Ascension/Poro king... They're all more popular (when u look at queue times) than Hexakill. Yet they rarely show up.
Zielmann2 votesThat's a difficult thing to measure by, because everybody's times are going to be different. If your MMR on hexakill is higher than it is for Poro King, for example, then you're certainly going to perceive the queue times as being longer for hexakill than PK.
Lovelle2 votesHexakill on SR blows. They tried it once, and I don't think they ever went back to it. Honestly, I think it's one of the better featured modes. I'm happy to see it show up fairly often. And I'd be willing to guess that it sees enough play when it's out to support bringing it out more often than some of the others.
My only issue is how much of an advantage siege champs have over everyone else. The problems that SR faces are multiplied on TT's small map.
Mages like 
are too strong and can make most team comps that play against them completely useless. Bruisers in particular really suffer on this game mode, at least on TT. There's just not enough room to dodge their spells and if they catch you with anything you're dead.
warpenguin5553 votesSR hexakill sucked, and its not on every other week
Blumpkin Nation2 votesEvery other? I think I've only seen it like, 3 weeks or more ago?
DarkRitual1 votesBecause it's the only way to get people to want to play on Twisted Treeline.
Also, they are slowly updating the older game modes to add to the rotation. We still haven't gotten Butcher's Bridge (making it NOT ARAM would be a good way to get it in without it just being ARAM on a diff map), as well as Backmarket Brawlers.
Erockandroll2 votesBecause it's the only way to get people to want to play on Twisted Treeline.
Also, they are slowly updating the older game modes to add to the rotation. We still haven't gotten Butcher's Bridge (making it NOT ARAM would be a good way to get it in without it just being ARAM on a diff map), as well as Backmarket Brawlers.
Some of the other game modes might have been less popular. And everyones has their own opinion on such game mode. (Personally, I feel like One for all has gotten stale, as a meta of "which champion synergizes best with 5 copies of itself" is developing. (looking at you Brand)) Personally I would like to see the Mirror mode version that was on the Hauling Abyss, but even that had it's flaws.
Not sure about Butcher's Bridge, since it really was just a map skin. (And not sure how Riot feels about supporting said skin) But it you developed a new game mode around said map, it might be interesting.
Not sure about Brawlers, but they should definitely bring back the Black Market from time to time. (Perfect excuse to run and test any half baked item that they come up with. Some of which actually could became permanent items in the game.)