Why do I doubt that there will be any online functionality? Because it's Nintendo. This is the same company that has sold and continues to sell Nintendo 3DSs without a power cord in the box. This is the same company that made a console that was so expensive to produce that it only recieved one price cut in its five years on the market. This would a very Nintendo thing to do, and should be a surprise to absolutely no one if the Switch launches without the ability to play with each other online.
This is the same company that released a $600 console and told people to get a second job. The same company that released expensive memory cards when other portable devices were using standard SD cards. The same company that released a revision of their most recent handheld and could only play a fraction of its games. The same company that lost a lawsuit for falsely advertising Remote Play.
This is the same company that released a console with a massive failure rate. The same company that used proprietary hard drives instead of letting people choose the kind they want. The same company that thought always online, no used games and kinect being required were great ideas.
i dont see you doubting each and every decision by Sony/Microsoft despite them making some dumb decisions.
When the herd loses its way, the shepard must kill the bull that leads them astray.