Personally, I'd like to sell our gamemodes over to Mineplex. They're not getting any popularity here, but in a minigame-oriented community, I think they could be much more used. Also, I think the server would probably be better at fixing glitches with them.
The devs here use priority as popularity, meaning that the MCSG bugs will be fixed first. When new ones come up constantly, they don't have time to fix other gamemodes' bugs, even if they may be massive. It's kind of like a genocide for players that are on MCGamer only for the other games.
So I don't think the gamemodes need to be removed. They just need to "have new owners." Honestly, keeping them here is embarrassing.