I know none of them are particularly young anymore but I'd like to see some combination of Cairney, McGinn and Armstrong/McGregor become established as the midfield 3 going forward. With the likes of Brown, Fletcher, McArthur etc. in and around the squad for experience.
I'm not 100% convinced McGinn will develop into anything other than average yet either, but outside of that lot I'm not particularly impressed with any of the midfield options coming through.