More consumers will always mean that Microsoft is looking to not only have quality games coming out, but also looking for ways to make their services better. As has been mentioned, better than expected sales in subscriptions could see Microsoft further diversifying their offering.Those investments were going to happen regardless of xCloud on Switch, as we've been seeing the past year.
Most aren't saying it's a bad thing, but if Nintendo users are getting most of the benefits, it's only fair to ask what direct benefits Xbox users get. Fairly normal consumer reaction. Why is that such a taboo thing to question here?
There may be nothing coming back directly from Nintendo, but indirectly, there could be a far greater incentive to invest even more in gaming because the returns justify them taking bigger risks.