I would question how invested the existing customers are in XAML. I have worked at about 6 companies that all use .Net exclusively and I don't think we used XAM

I would question how invested the existing customers are in XAML. I have worked at about 6 companies that all use .Net exclusively and I don't think we used XAML once except for maybe an experiment or PoC. I think the XAML stuff relates more to trying to make things move between devices more easily by using generic ideas like stretching, grid layouts, flows etc. I guess MS are still holding onto the write-once use anywhere ideal which has never made it particularly well in any stack.