The two biggest international airlines in the world discuss the issue since months now amid a time where improvements on the revenue side are more or less impossible to realise.

Demand in Y is pretty solid though. Several industry experts expect the trend that the percentage of tix booked in non premium/non flexible booking classes will increase continuously.

The competition is producing significantly cheaper and realises economies of scale flying all eco planes...Lufthansa already realised a comparable effect increasing the number of seats per flight on several routes to reduce the cost per available seat kilometer

Pilot unions at all major airlines still do not accept the obvious fact that feeder traffic within Europe has to be produced as cheap as possible, so hardly any chance on this front as well...

Swiss tested the waters on some routes, KLM tested the waters on even more routes, results were amazing...

KLM did not even realise a significant drop in customer satisfaction after introducing a 3+3 seating years ago, but was able to grow significantly ( also in terms of margins ) KLM was also able to counter the drop in yields on several bread and butter routes to/from Schiphol, because they increased productivity...

Customer will not have a choice anyway, because it will become a joint approach by all major airlines.