If we'd talk about another Microsoft, then yes, they would at least support their former flagships. But we'll have to arrange ourselves with the Microsoft we *have* not the one we *want*. In my opinion, W10M will be put to an end together with the whole Lumia device family. There are like two or three non-Lumia devices out there, so literally nobody will miss it.
Both brands, "Lumia" and "Windows Phone / Mobile" are burned, like "Vista" and "W8.0" were before.