Why should it be dead? Microsoft is still pushing out updates to the OS and the apps.
You laugh but I had a 650 for a long time (bought cheap, used) and at first it sucked but by now it's quite nice that .... yes, I bought myself a new 950 just last week. Yes, mid 2019 and I'm just moving into Windows Mobile 10.
It's a nice phone. I quite like it. I am happier using it than iPhone or Android.
I'll be honest, my BlackBerry 10's are much more capable and will remain the daily driver for the near future, but the Lumia's can get the job done still. (At least for me).
Now I just need to figure out how to transfer some apps from 650 to 950...I am a little sad Microsoft seems to have recently pulled the Translator...