He does have a point with one thing. Mario and Zelda both sell best when it concerns the main world.
The top 4 best selling Zeldas were set in Hyrule (and I believe that only 6 of the 14 are, but I may be wrong). And Mario also sells better in Mushroom Kingdom than outside it.
However! That's more of a "used to be" than how it actually is. The Wind Waker countries appear to be a success, and Galaxy also sold well for a non-Mushroom Kingdom game.
Yes, my reply is somewhat off topic, but it was directed at the only part I really cared about.







