It's a great aircraft and quite an accomplishment but it's not a good fit for most airlines and most routes when you have more economical options currently and in the near future. 4 engines burn a lot of fuel and require a lot of maintenance compared to a twin engine. Cargo, which can make or break a routing, is more limited compared to other long haul aircraft particularly on certain routes where having two flights per day vs 1 on an a380.

EK will use them on their high demand routes for another decade or two if lucky but economics and fleet flexibility will win which is where the 787, A330-NEO, A350, 77W and 77X will shine. Airlines like SQ, BA & LH will continue to operate them for some time on high demand routes. KE & OZ and to a lesser extent QR will use them similarly but as a flexible capacity option for mostly seasonal demand. AF wants out and NH will use them on their Hawaii routes. Retired jets will be used for parts.