A full year of Green is an improvement and should more than replace the 0.2 WAR Hicks provided to the Jays last year (and the 0.3 that Green provided himself). Seems highly likely they'll add a DH, who will replace Belt's production. What is ironic is that this time last year, most agreed this was a legit WS contending team. Running it back with a very similar roster seems like a disappointment and failure - but that's almost entirely based on the recency bias of the results of 2023. The reality is that this is still a very good baseball team as is. Yes, some players are year older and that's likely to hurt them a bit - but we're also full of players who are still young and/or entering their prime. Just as you'd expect the old guys to slow a bit, you should also expect the younger players to improve a bit with experience.
Would anyone be shocked if we got career years out of Bo, Vlad, Jansen, Biggio, Varsho, Kirk, Espinal, IKF, etc? I certainly wouldn't be (and yes, I understand there are different probabilities of each having a career year).
Also - the goal is to be the best team in October - not May. I think we forget that sometimes.