The Reds expect their rotation to improve in 2018 and how could they not. This season, the Reds gave 46 combined starts to Lisalverto Bonilla, Bronson Arroyo, Tim Adelman, and Asher Wojciechowski. Next year, they expect to pitch only guys who may have a future as starters with the team.
A couple of weeks ago, I wrote an article in response to an Enquirer piece where Dick Williams suggested the Reds would seek a quality starter for next season. They will definitely explore the possibility.
As things stand now, though, the Reds have a bunch of guys that could impress enough at Spring Training to secure a spot.