Unfortunately, don't expect a clear from someone from MS.
Having ported my app from WPF to UWP in the last few months, I can give you some pointers:
- there's great news, when it comes to the future of UWP, on the UI side (WinUI). There's a long way to go until it is complete. As far as I know, we've been promised Mid 2020, but we'll see
- UWP is DEFINITELY not for everybody. And it's not because of the differences from WPF - with a lot of cursing, you'll get through and adapt. It's because of the underlying WinRT - which UWP is forced to use for anything not UI related. And WinRT, to put it mildly, sucks.
- A lot of UWP's limitations come from WinRT. Fortunately, there are people at Microsoft that actually care about us, the developers, and are willing to help. So on my mind, the future is a bit gray, with some light at the end of the tunnel.
- MS will definitely not kill UWP - they are waaaay too invested in it. A lot of the Win10 UI is UWP
As long as you don't need to deal with too many files, probably you could give UWP a shot. Do expect a lot of friction at start.