For the time being, talent is limited. Their costly engineers' time might be spent more productively on other products. Windows is already no longer their prima

For the time being, talent is limited. Their costly engineers' time might be spent more productively on other products. Windows is already no longer their primary cash cow (nor even their secondary -- IIRC, it comes third in revenue after Azure and Office). I don't think they will kill windows any time soon, but I do think that the probably is non-zero, even in the not too distant future.