Oh, I'm not talking about better game modes or even making Summoner's Rift a 3v3. I'm talking about the feel, the identity of Twisted Treeline, and making it better.
Twisted Treeline has a spirit, all pun intended, that Summoner's Rift lacks, and it's that spirit that should be preserved.
We got Bilgewater and the Freljords in ARAM, we got Demacia and Noxus on the Rift, and while Shurima and Ionia still don't have representation, I think we would be doing a disservice to just let Twisted Treeline die and take the Shadow Isles with it.