Well you could say that's another former Duo route replaced, but I'm not sure how business pax would take to a sub-daily frequency. DUS is only a short hop down the autobahn / ICE line from Cologne, with a much higher frequency from BHX. FRA is also only 55 mins from Cologne by ICE. Combined with the shuttle parking at CVT, I think most business users will stay away, whereas CVT has offered a more realistic alternative for cities like Valencia, Marseille and Naples, where no direct alternatives existed from the Midlands, or even from MAN.
Buster, how long would you give this route? 6 months?