That is correct. The slot pairs for expanded longhaul will come from the likes of DUS/GVA/CPH/MAN, not at the sacrifice of a whole route such as LBA. LBA is actually going from strength to strength. What is hoped, is that when it improves enough, a nightstopper will be introduced, but at the moment, it would simply increase the costs on the route too much.
ALC etc are indeed in order to increase aircraft utilisation, and about using the resources where they can perform best.
Kind regards
Mike