The trans atlantics will of course also benefit from inbound US marketing too & many will be arriving in "London" & not Stansted per se.
Primera have stated the inbound bookings to BHX led to the reductions there this year.
Evolution is the name of the game now with new variants of the A321 & B73M & even if the operators come & go the evolution & technology will be a basis for permanent change in some market segments.
Times have indeed changed for STN & must be at business critical mass,now at 26m
pax,next year 28m? & then well on the drive to 30m making it one of the major airports in Europe.