3DS has been out 6 years and sold around 65m
WiiU has been out 4.5 years and sold around 13m...
So you can't really say that, when the best selling has been out 6 not 5 years.
3ds average per year: 10.83m
WiiU Average per year: 2.88m
Combined average for 5 years: 68.55m
Or without using averages.
3DS first 5 years + WiiU till discontinued = 70m.
Please refer to the 1st sentence of the OP. I was already taking that into account.
Right... just because you admit to using 6 years data for 3ds not 5 years, doesn't explain why the target for Switch is 80m in 5 years, when 3ds+WiiU did not manage this (like you wrongly said in the post I originally quoted.)