It will be interest to see whether BFS sees an increase in "connecting" passengers from GB: first flight in on a cheapie U2, LS, EI flight and then onwards with CO. An 11:15 int'l departure shouldn't be too tight for many domestic arrivals.
I doubt there will be any.
CO/UA recently stated they were paying the APD to prevent price increases from Belfast, making it cheaper to go from Dublin as a result. All this reduced APD will do is help CO/UA reduce the loses and hopefully encourage them to keep the BFS-EWR route open.