To suggest that KL have a criteria that to withdraw would allow in competition is lost on me
I know that as an example HUY have spoken with similar operators in the past, not to serve AMS but feeder ops to other major hubs. KLM are pretty unique in that they offer a service that BA couldn't hope to offer, and connect many of the smaller UK regions to the world. If they left some of those airports, they risk losing premium passengers to other airlines wanting to feed their respective hubs. Clearly if there is a cost issue then they would take action, but after a few decades of serving an established market they have yet to show evidence of wanting to consolidate.