Right; they would only gain efficiency.
I guess it depends what you mean "blow away" as. At least 2x RAM (available for games, assuming), 1-2x GPU power, and at least 2x CPU power. That's at least twice the machine.
It ain't no XBO, for sure. But you could easily make a Switch game the Wii U would not be able to run.
I'm curious to see how they divide up the ram for Switch.
Only 1 GB of Wii U's ram was dedicated to games.