Yaya could still have a lot to offer us.
He is a much better player than Xabi Alonso who featured heavily under Pep at Bayern and IMO could excel in the holding role. The holding role has adapted since the day of Makelele depending on how the side sets up. Rather than being a strictly defensive position, more sides are starting to use the holding role for a player who can dictate the game from deep.
Pirlo, Cazorla, Pjanic, Pizarro and Kroos are examples of players who have been utilised as deep lying playmakers and are not known for their defensive ability.
Whilst Yaya's lung busting runs might be a thing of the past, there are not many players better in world football who are as comfortable in possession, can pick a pass, or score from long range as Yaya.
If he is up for the challenge, has a decent pre-season and loses a bit of timber he could be a vital player for us next season.