It would be great to see Apple do the same...
They have done this with Apple music (support on Android), if it will help you sell more watches/subscriptions would it hurt?
I'm sure AndroidWear will not be allowed the same tight integration the Apple Watch has, the same way many Google services and apps on iOS are hobbled. There's an element of, "Oh they want crap? Then give them crap," here.
Its also depressing that the narrative here is, "OMG They're letting us use some peripherals of our choice with our phones? How generous!" Its sad how far we've fallen from actually being able to use the things we buy.
Also, Apple Music on Android isn't even released yet :-/