This one has all the right elements, but it’ll ultimately come down to how the story is presented and whether they’re able to let us get to know Ross and his teammates or whether it’ll just be a fluff piece summarizing the Cubbies getting to the Promised Land (no, not that Promised Land).
At this point, it’s near impossible to speculate on the future quality of this movie.
There are plenty of great sports stories, both real and make believe, that have been turned into wonderful movies, and there are plenty more that have been somewhere between bad and mediocre.