About 10 million to go after end of this year? Seems doable.
Sales should start falling next year a bit, but I doubt it'll be a drastic fall from the ~6 million of these two years. I could see it knock out 8+ million in '22 and '23. Assume a spring '24 successor launch (doubt it would be any earlier than that) means by launch of successor it'd maybe be 1.5 million or less to go. I think with a Spring '24 successor launch Switch will just barely eek by DS, but will easily pass it if a holiday '24 Switch 2 launch happens.