3rd parties have seen how their new ips sell on the Wii. If Nintendo was to try to put some of their older ips on Wii, they might only fair as the third parties do as they would be like new ips since many of them haven't been released in 20 years.
How did Punch Out and A Boy and His Blob sell?
What sells in the high millions on the Wii are Wii Sports games and games featuring Mario.
You seem to say that Metroid has been popular this gen, but even though it's from Nintendo the games in that series haven't sold anywhere like Mario or Wii series games.
A new Luigi's Mansion game could be interesting.