Frankly, I believe the writing is on the wall.. I believe Ms silently gave up awhile ago. We all know Nadella's feeling about the mobile side of things.
Ms is already catering to a small market and fan base. With the recent numbers it's easy to chalk it up to a lack of flagships or quality device releases. While some fans hold out, others just give up. It's hard enough to win new fans and adopters of the platform but even harder to win back defectors. People who jump ship , even temporarily, find that you can have a better MS experience on rival OS's while enjoying the perks of an abundance, higher quality,and better maintained app market.
I believe Ms has known for awhile they were trying to save a sinking ship and that's why there were so many cancelled devices. That's why there is no marketing/advertising. Why spend the money when you know there is virtually no return? Look at places where it has had decent numbers over the years compared to now.... People are fleeing! People are tired of waiting for apps , flagships and for MS to catch up. Especially when you hear more about them developing for their rivals, and when one of the execs of mobile takes a sabbatical and uses an IPhone.... Ms has all but said that they do not care about mobile.
I still love my Windows phones although it's not easy, and they don't help ease the pain. There strategy is very poor in mobile and that isn't accident, especially one a company of their size and resources should make. I believe it's intentional, I believe that are slowly abandoning mobile. I've supported mobile very hard over the years. I own a 520, 830,925, (2) 1020, and a 1520. Even I'm fed up. I will stick it out til the alleged Surface, but if it doesn't impress or if things get any worse, I will move on... I can't keep investing in a platform that isn't growing or going anywhere. And if I leave mobile, I will leave pc as well