The fact that the Switch is somehow outpacing the prime DS at this time is insane. I remember everyone only a few months ago thought that once this year comes the Switch vs DS fight would be over with the DS killing the Switch in its prime. However, the Switch is proving all of us wrong. We'll have to see if the Switch keeps this up.
I'd be surprised if Switch didn't fall further behind the DS in the next two years. If Switch sells more than the DS lifetime, then it will be due to a longer lifecycle and better post-successor support, both of which got cut short for the DS.