CX and SQ are adding narrow bodies to their fleets through the mergers with Cathay Dragon and Silk Air respectively. QR, EY, ET and TK already have narrow bodies. The days of an airline operating an all widebody fleet may be over for the foreseeable future. Instead of scooping the cream from the top, i.e. the long haul premium traveller, airlines will need to cater for a much broader range of customer in order to stay afloat.
The easier to fill, lower operating cost, more flexible, and increasingly longer range single aisle aircraft are going to play an important role going forwards. CX have pushed the B777 - 9 back until at least 2025 and are introducing the A321NEO.