The Yankees have an issue with their rotation. It doesn't look great for 2017, but that isn't even the biggest concern. If Masahiro Tanaka opts out of his current contract after the 2017 season, the starting staff is essentially empty in 2018 and beyond. CC Sabathia and Michael Pineda will be free agents, leaving the Yankees only with a handful of young arms like Luis Severino, Luis Cessa, and others to take the ball every five days.
The combined presence of Tanaka, Sabathia, and Pineda on the roster right now means the Yankees should be able to survive this year without a disastrous rotation, but beyond 2017, all bets are off.