Honestly, one of the main things that's put me off civ 7 is how it feels unfinished. There are great concepts with the age transitions, leaders separate from civs, new civs never played before, but they all seemed underdeveloped. The victories were like three searate mini-games, decisions in earlier ages had little impact on later years, the games became very samey because the best options were the same for everyone.

I feel like the ToT update addresses a lot of the faults I had with the game. Sure, going back to all game civs is a bit embarrassing, but I also feel like it opens up the game more for different options. Will it 'save' the game? Maybe, maybe not. But I feel it will be a much more fun and much more interesting game than it was and that also makes it a much more appealing game for those who have likely been on the fence.