Is Windows Mobile dying? I guess that depends on what you mean by "mobile". Windows smartphones are dead. Microsoft completely gave up on it when that fool Satya Nadella took over and got rid of all the INTELLIGENT PEOPLE THEY ACQUIRED FROM NOKIA. Their plan now is to focus almost completely on services and make THOSE 'mobile'. Or, probably more accurately, ubiquitous across all platforms. So, in that respect, mobile isn't dead, it's taken on a completely different paradigm.
With that said, I've pretty much given up on Microsoft. I've gone from being one of their biggest cheerleaders to someone who simply feels Microsoft is the lesser of three evils--I despise Apple and Google and all their holdings with a passion unmatched in human history and I have nothing but disdain for anyone who actually LIKES them.
I have grown up with DOS and Windows. I was an early adopter and fan of the PocketPC (I've had the iPAQ 3630, the Dell Axim X5 and X3i). I bought each of these the first day they came out: Samsung Focus, Lumia 900, Lumia 920, Lumia 1020. I reluctantly bought the Lumia 950 (biggest waste of $600). I enthusiastically tested Windows 8 as soon as they allowed us "common people" to play with it. And then....Windows 10/Windows 10 Mobile was revealed. The very first day I tested both I new I was never going to have faith in Microsoft ever again. It was disgusting by design. Microsoft PUKED over every thing I loved about Windows 8 and, as far as I was concerned, just caved to all the numbskulls who loved Windows 7 and insisted they go backward. That's the opinion I hold to this day.
Microsoft has taken everything I started to like and then systematically destroyed it. The bought the devices division of Nokia and destroyed Lumia. They came out with the Xbox One with Kinect and then crapped all over it, destroying the interface and making the Kinect a useless piece of junk. Now our Xbox sits in our shed, the Lumia 950--which, despite a FASTER camera, still sucks compared to my 1020--sits on a charger, only being used to continue to test how much Windows 10 sucks with each subsequent build. So, for my household, we are sticking with WP8.1 and Windows 8.1 on all devices that really matter. Anything else using W10 is purely to continue to prove how much we hate it. Microsoft now sucks only slightly less than its competitors. Windows smartphones are dead, for all practical purposes. Windows "mobile" will continue on as nothing more than various services available anytime, anywhere. THAT is obviously their "mobile" strategy.