He has one major task: Trade Marner.
Anything else is lipstick on a pig.
I predict Leaf Nation fans overall are going to fairly disappointed by this upcoming season and not a lot Treliving can do about it.
The end result might be looking at a year where the core 4 all return and Leafs have 4 X Top 10 highest cap players all the same team, and now propped up to new heights with the pay increases of Auston and WIlly's new deals coming into effect.
Fan's and Leafs Management and Ownership will look at summer 2025 when you have Marner coming off the books, & you have Tavares contract set to expire - $21M in cap space right there just with them alone. That is the most probable outcome. IMO
Marner doesn't strike me as an overly mature individual willing to sit down and cooperate with MLSE and accept they would like to move on from him in TO. His agent Darren Farris is a known ahole around the league when it comes to player agents working with teams, and we all know the names of Paul and Bonnie Marner his parents, because they also are not shy to speak their mind publicly when it comes to Mitch and his contract situation. Couldn't think of a worse situation full of landmines for Treliving to navigate to force change against the wishes of everybody else involved.
Maybe Mitch will surprise and realize its in his best interest financially to work with BT on a sign and trade to a team of his choice, that wants him at his new contract rate and willing to part with assets to bring him in. But colour me skeptical that this is even a remote possibility, but if BT can pull this off then we might be looking at this as pulling off a miracle.
I'm far more likely going to expect Marner to go public and say he plans on playing out the year in Toronto, because his contract allows him to and he doesn't care what anybody else thinks nor wants because only his opinion on the subject matters.