Twisted Treeline has a devoted community that have played the game mode for years. Riot say they've tried to improve Twisted to increase its popularity and give the example of the 2012 Twisted Treeline rework (7 years ago!). Riot has not been trying to improve Twisted Treeline for a long time but the solution is not to remove it. The solution is to actually consider Twisted Treeline when changes are made (e.g. Qiyana's release) and work on getting new people interested in Twisted such as holding streamer events or in game events.

Change can be made to bring Twisted back to life. Riot, don't kill Twisted.