In the hypothetical situation that my phone were to die without warning, then yes, I would be going to android, my current choice would be a Sony Xperia Compact, otherwise, I don't want to leave WP (still on a L920 with WP8.1, 4 years now...) I wouldn't mind going to W10M, but the incentive just isn't there. The lack of apps isn't a major problem for me, but it just shows that the platform isn't getting support, and no one really cares about it. When the next big thing comes along, it's highly doubtful that it will come to W10M.
At this stage it's hard to tell what got sold from Nokia, meaning some of their cool tech may be with MS and no longer available, and in addition to that, the Nokia 6 doesn't look all that high end. Wait and see I think.