Except for the A380, other quads (A340, B747) are receiving very few orders. The question is, how long will the A340 and B747 production line remain open? With the rollout of A350 and B787, it will probably make it worse for the quads?
Existing B744s, A342/3s BAe146s and Avro RJs are slowly being retired from major airlines, at some point, will it come to a stage when trying to get on a quad is as hard as trying to get on a L1011 at present?
My guess is by 2025, most passenger quads will be A380s, with a few rare examples of the others operating in the developing world.
What are people's thoughts on this?