It just has hit 10 million ! Wow!
I believe the Switch will be fine for, at least, 04 years. If it reaches between 60-70 million units sold at the end of its commercial run, Nintendo will be ok.
If it gets the same support that the 3ds had, I don´t think that it will need all those big AAA western titles to succeed, specially now that all Nintendo´s software development is focusing on a single device.