^Wii has reached its peak, ROFL
Wii for years was on a trend overselling the PS2, now it's dropping off hard, that is not because it reached its peak,, it has yet to even pass the PS1 in sales, let alone even get near the PS2, its because Nintendo thought like you do that it had nothing to learn from the public and made games that it wanted to make, but that did not move consoles.
Nintendo had plenty of room left for the Wii to grow if they had continued to pursue the strategy of the early Wii. Instead they followed what they did and the Wii went into a decline they were never able to truly reverse.