I love this game in spite of its faults and failings, and I love Yoshi P and his team for doing what I think is a good job, especially in a company that holds different interests than he and his team. I don't think changing him would help, because I feel the stagnation is more a result of SE themselves. Lately, they have treated their historically best games as cash cows and commodities, and have disrespected some of their classics terribly, as their recent PC ports from Nier's bugginess on to the recent "definitive edition" of Chrono Trigger that is actually just the mobile garbage have shown.
They show such a lack of love for new and old games alike, that I don't honestly think anything in this world would convince them to give Yoshi the needed people and funds to finish fixing this game for its lifetime, but switching him for someone else of SE's choice would likely just hamstring the game entirely. I do think 14 has potential to be a lot better, I just don't think that they will let it be, and that's a real shame. Hopefully I turn out to be wrong, but game companies in general have only given many of us cause to be cynical lately and SE themselves aren't really bothering to do anything about it as long as the dollars flow, which I am sure has been said a million times already here.