Losing J-Hay would be a good thing, and I think that they will keep Cervelli around.GMNH said this is the base of the team likely to go into next year too. Likely without J-Hay, Cervelli, etc. So another under .500 team here we come.
A rotation anchored by Taillon, Williams and Musgrove isn't the worst thing, and it's not unreasonable to expect Archer to be a good bit better and Keller should be up at some point next year. And with the backend of the bullpen set, the staff should be set as the foundation to give this team a high floor.
That said, assuming that they keep Cervelli, the only positions I would feel confident about heading into to 2019 are CF, RF and C. They have to hope Bell comes back next year as at least league average, but either way, he'll be locked in to a ton of at bats. Dickerson will play LF, maybe Luplow and Martin and Reynolds push him from the minors, but there's no guy like Meadows anymore ready to step in. Moran and Freese are likely just going to be placeholders for Hayes whenever that happens. Frazier's strong 2nd half will likely now block Kramer from getting AB's. And who knows about SS.
All in all, they have a lot of unclear options for how to dole out AB's next year.