2004/2005-2.68 million (13 months)
2017-3.31 million (10 months)
2019-4.5+ million (estimate)
PSP had an unusual sales curve having a slight decline in year 2 then big growth in years 3 & 4, a big decline in year 5 then another rebound in year 6 before finally tapering off for good.
If Switch has a more traditional sales curve of steady growth for 3-4 years followed by a steady decline for 3-4 years than it's possible PSP can start to gain some ground on it later in its life but at that point it will be too little too late.
When the herd loses its way, the shepard must kill the bull that leads them astray.