While I agree we're unlikely to see a T1 Jitney any time soon, for DL the TATL JV (AF and KL) is how they route traffic to pretty much every secondary and many primary EU cities, especially outside the summer peak season.

As for the comment upthread about KL moving to T1, spaces issues aside they're better off in T4 with DL where transfers are much easier and the lounge is good enough. Co-locating KL and AF in T1 doesn't really accomplish anything from a passenger perspective, and arguably makes things worse by needing to reclear security when EU-bound.