Paolo Ferrazza - You sound like a delusional Black Berry fan when their market share had dropped to 3%. The truth is many apps are stopping support for W10M including many popular titles and business apps. Yes some people are putting a few apps and games out, but nothing major.
The point of going win32 is you would instantly have a huge library of apps and games and buyers would be guaranteed they would get plenty more. MS is also making it easier to port apps to UWP with their desktop converter. Not so with W10M.
But they do also have to get these devices in carriers and offer them on contract plans. The vast majority of people in the US at least buy phones on contract and they get them in brick and mortar stores. The last year you couldn't hardly find any Window Phones and Sprint only carried a few 2 year old models online.
So yes, W10M is on life support, and about the only thing that will save it is switching a x86 chip.