Since the route was only announced on 25th February it's probably a bit premature to make it year round. I would have thought they would give it a month or two and see how bookings for the route are
The reason we're pondering this slightly earlier than usual is probably because when a route to EDI was announced out of NOC, it had the same scenario... Seasonal flight ending before Winter, but then 1 month before the route started in March/April, they announced that there would be extra rotations and the route would be made year round.
Obviously there is still time, and I might have been a bit pessimistic in my previous post, but I do hope LDY can develop it's relationship with BE and have numerous year round routes in time. With the UK City of Culture title for the City, increased visitors could really be good for an airline like BE!