Shouldn't the comparison be 2007?
No. Switch was available for 10 of the 12 months in 2017 launch month easily making up for the lack of Jan/Feb.
2007 vs 2017
2008 vs 2018
Thats the best comparison we can make for Wii vs Switch.
When the herd loses its way, the shepard must kill the bull that leads them astray.