I keep hearing Switch is too expensive, but the truth is, if it's sold out all the time, then it's definitely not too expensive!
If Nintendo can maintain a strong pipeline of games (I am impressed with the monthly first party releases and there are a few excellent third party picks too), then I think 50 million is more like the bottom for the Switch than the top, and Wii is well within reach.
Next year will probably be the point where we get clear evidence as to where Switch will land, right now the supply issues are muddying things, and it's looking unlikely to fix them before the holiday season gets here.