I have a feeling that the NMA they have been working on may not have stood up too well against the A321XLR or wasnt worth the effort to compete with the 321XLR. Airbus has probably been working on their own NMA as well, who knows.
A bit of a shame to toss a few years worth of engineering and development, and another 5 or 6 years to market.
Agree that the 767F is viable, but betting the 767 to FBW probably just is not worth the effort.