We would have to see if it follows the pattern of the most recent Nintendo console and handheld. Since Wii U flopped, we'll basically leave that out but Wii and 3DS
Wii
Year 0 - 5.84 mill (late Nov 06-March 31)
Year 1 - 18.61 mill
Year 2 - 25 mill approx (Peak Year)
Year 3 - 20 mill approx
Year 4 - 15 mill approx
Year 5 - 11 mill approx
Year 6 - 4 mill approx
3DS
Year 0 - 3.61 mill (Feb 2011-March 31 '11)
Year 1 - 13.53 mill
Year 2 - 13.95 mill (Peak Year)
Year 3 - 12.24 mill
Year 4 - 8.73 mill
Year 5 - 6.79 mill
Year 6 - 7.2 mill approx (Pokemon Go bump)
Switch
Year 0 - 2.74 mill (March 31, 2017)
Year 1 - 15.05 mill
Year 2 - 17 mill approx
Year 3 - 20-22 mill guesstimate
It's hard to look at any of those prior systems and say you could gauge anything by year 3 though. Year 4/5 is where the mountain starts to get a lot steeper and the climbing gets harder.
