Switch 2019 (3,543,024) overtakes full 2018 sales (3,482,388) by 60,636 units!
Current lead YOY: +1,111,929
4 weeks to hold this lead.
In the next 4 weeks switch would need to sell an average of 262,823/week in order to keep the lead as it is now.
I don't think the lead will grow by the end of December. It's already going to be hard to keep this lead knowing SSBU released last year.
As big as Smash is, I'm sure the addition of the Lite will offset smash increase, then there's also a mainline pokemon and RFA that's going to push hardware for the rest of the year. I'd be very surprised if Switch is not up YoY compared to last year. I'd give launchweek (next week) to last year, but expecting every other week to be up the rest of the year.