Next season is definitely a crossroads year. They're starting out at a much better baseline for the rotation and the bullpen then they did last year before free agency began, which is good. No reason to dumpster-dive for reclamation projects for the rotation, and if anyone does get signed that way they should know they're not getting in on scholarship and might be moved into a long relief role. Personally, I would say the standard on the rotation is "don't sign anyone not expected to be better than Joe Ryan. This is not a knock on joe, but a notation that their improvement need to be top-end, not backside)
the lineup is where we're really looking at uncertainty, despite having a number of quality players. We don't know who plays SS. The entire OF has amazingly high variance. Larnach & Kirilloff are really talented, but have never shown it over a season because of injury. Wallner has only a cup of coffee. Buxton is awesome, but seems unlikely to reach 100 games for the 5th straight season. Celestino has shown improvement, but is still young. Garlick can't stay healthy. Kepler seems to have hit his ceiling and the 2019 explosion looks like a juiced ball fluke year. They need decisions at 3B, SS, and 1B and reinforcements at catcher.
If the lineup implodes again next season, then we're looking at really big changes, because it means that guys like Kirilloff/Larnach/Wallner aren't able to step in and be the future in the corners. That they can't find a defensive home for Miranda or Arraez. And if that happens, I think you'll see bigger changes in the team, from the front office on down. YMMV on how beneficial that will be.
They need to get the offseason right, they need a little injury luck, and they need a couple of young players to really be hitters. A rotation with Mahle, Gray, Ryan, Maeda, & Ober could be quite good. A bullpen with Lopez, Duran, Jax, Alcala, Thielbar & Moran could be quite good. But they'll need a lineup of Polanco, Buxton, Arraez, Miranda, Kirilloff, Larnach, and jeffers to also be good and to play.