But KEF is merely Icelandair's hub for their route network to/from N. America and I don't believe CWL is served by Aer Lingus.
I guess we will see in the future but I'd be very shocked and surprised if KLM left the airport over the arrival of Qatar and any future growth especially as KLM and Air France and partners are expanding their offerings from CWL with the new Jet Airways codeshare and expanded Air France codeshares on Flybe's CDG service.
Well Flybe codesharing with AF reduces the AF pax that may have codeshared on KL, when I travelled AF CWL/SIN I had no other choice than to route CWL/AMS/CDG/SIN.
KLM take their Asian market very seriously, until a year or so back they were the only carrier offering direct services between Europe and the Philippines, now there is another carrier but they're cr@p! ... And a third if IST is considered to be in Europe!