There are some credible rumours that Nintendo and Microsoft are working on 'something'. We know that Xbox Live is already on Switch with Minecraft, but we are already seeing more Xbox Live enabled titles on Switch. However IF Microsoft manages to become the exclusive partner by putting XCloud and Game Pass on Switch, it would be game changing.
This would mean that Xbox has access to the Japanese market, having Japanese game developers developing on Xbox Console XCloud Servers to target the Switch is what I think MS angle that would happen.
However, the cost will be massive for Nintendo, as this would bring the death of native third-party titles to the Switch, since Cloud >>> Native, Cloud simply has more developer power.