With PS4 in the equation, though, I think you are more likely to see a non-UWP PC build be a common root that other builds (including a UWP PC build) are adopted from.
True the sheer popularity of PS4 makes it a strong focus for publishers. But is BF1 ported to PC or vice versa? It uses DX12 on PC. UWP doesnt have a specific programming language, you can use the same as you do now for PC no?