Not only that, but we get the RARE catalogue back in Smash too, and perhaps a nice Diddy Kong Racing expansion for Mario Kart.
I think having Nintendo games on Xbox would only be healthy for Nintendo; IMO, properties like Metroid will inevitably see a much larger audience among Microsoft fans as the game fits that Xbox niche better than a Nintendo console - while this may seem like a surrender for Nintendo, it will allow the Xbox base to warm a lot more to Nintendo hardware; and then there are companies like Bethesda who would probably find ways to benefit from such a relationship.
I describe myself as a little dose of toxic masculinity.