Give me compelling reasons/proofs why Wii sports or Wii Fit won't be huge system sellers again for WiiU

[gum]

Conina said:

gum said:

I'm not the one who make big claims, remind you, quite the oppoiste in fact: I'm not saying I'm 100% sure that WS and WF will do extremely well but I question the fact that many seem to be totally sure that WS and WF won't be big sellers.

Without hardware-bundling (Wii Sports to the Wii, Wii Sports Resort to Motion Plus) "at least more than 10 millions each" seem to me like big claims and "doing extremely well".

For games from ips that sold so well in the past it's reasonable to expect at least that much without very compelling arguments to prove the opposite. Is it a big claim to expect GTA to sell at least that much? Why would it be for an ip which has always been bigger?