Some fair points from both DYKWIA and WouldLovetoFlyFirst.
In terms of network coverage/scheduling : agreed EK score well, in fact very well.
BUT ... by combining different carriers (not always ideal wrt FFP status/mileage accumulation, admittedly) it's possible to find better J class configs to most major destinations.
On the matter of differentiation between J and F : yes, this is certainly a possible factor. However, I'm of the view that the real battleground these days is not the matter of differentiation between the premium cabins of an individual carrier, but the overall quality of the J product across competing carriers.
And ultimately that's why I believe EK - with all their knowledge & experience - have missed a trick with this revamp.
EDIT : yes, eternaltransit, I too am more hopeful for the 777X, where (I would like to think) EK will surely want to raise their game.