I do not think this will directly affect the OSN. There's no reason why Nintendo can not use servers now, because they do not know that P2P is much cheaper. Nintendo already has partners that could make a much better online system.
I really want to hear something official about this until at least next year, if so, and I doubt we'll see the results until very late in the switch's life as soon as 2021 or 2022. It's going to take a lot of I + D, and if Sony is starting, Nintendo will be a little behind. In addition, Nintendo does not need ATM streaming. Microsoft needs to start early to begin testing and R & D, Xbox One is the third in the world, so they need additional users, Nintendo is fine and their current strategy revolves around the ability to play without Connection. I do not see Nintendo launching any Azure service until the transmission becomes a clear player in the industry, and again, as soon as possible it will be 2022, even if Stadia does it well, I doubt it will hurt Switch too much in the short term .