2v2 ladder would definitely bring in lots of people, just so that they would be able to play with friends.
Super troops gamemodes, like instead of draft, have normal 1v1 with evos and super troops. Also all clan wars gamemodes like touchdown, draft, classic battle etc should be permanently available.
King towers with some abilities, like champions have. The goblin queen is one decent example of what those abilities could look like. They could also be activated manually be spending some elixir. As long as it can be obtained without being paywalled I wouldn’t be opposed to it.