Both A BMW 323 and a Ford Focus have four wheels and seats. But they are differentiated.
32" seat spacing in an A320 and 28" seat spacing in a 737 could be differentiated as well.
But all I see is BA going down (reduced seat spacing, cheap seats, chocolate free biscuits) and the likes of Easy coming up (flexible tickets, pre-allocated.
Depressing that no one really sees a future for them. The long haul economy will go to Locos. Premium traffic eastbound has gone already to the likes of SQ, Etihad, Emirates. That just leaves the pond...