Unlikely. The Switch is a basically just a WiiU that has been revised to also work in portable mode.
That was a clever move, because as a portable console it is very attractive, and as such I can very well see it reaching 3DS level sales.
But as a home console, it still suffers from more or less the same disadvantages that the WiiU did (like being severely underpowered in comparison to its competitors PS4, Xbone, PC, which will for example lead to many AAA-titles simply not being ported over to Switch).
So if anything, I think you should rather add WiiU sales + 3DS sales, not PS2 sales + 3DS sales.