I considered writing to Loganair about that, but Flybe (and associated ventures) lost a lot of credibility when they were last doing the NWI-DUB route with the whole £280,000 rebate kerfuffle when they paid actors to fly to make up the numbers.
That said, they have now been eyeing a DUB route now for some time and nearly got Aer Lingus Regional, but Southend was piled upon them by Stobart. Using the Do328, I'd say that a DUB route would surely be profitable... The management have been talking it up again lately, the link below explains something (I hope).
Norwich Airport aims for take-off with wider route network - Business - Norwich Evening News