Nintendo went from 20 to 100 million between GameCube and Wii, so it is possible to see jumps that high, possibly higher. A 5X jump to NX would mean about 70 million. It'll be interesting if NX can beat the Cube to Wii improvement.
Strong software is key. Wii had: Zelda, Wii Sports, Super Mario Galaxy, and Metroid Prime 3 in its year 1, and that was alongside a bunch of other games. Immediately Wii's year 1 was Nintendo's strongest year of releases ever. Nintendo needs a repeat of Wii year 1 for NX.
I describe myself as a little dose of toxic masculinity.