To be fair though.
The Game and Watch is a handheld console.
The Boxing Ring can go either way (since it's technically a Smash/Punch Out!! stage and not just one identity).
You missed my point.
Saying that a G&W stage won't be featured on the Wii U because of the handheld/console content rule is complete absurdity when you consider that exceptions to the rule exist.
Yes, the Boxing Ring can be Punch-Out themed or Smash themed, but it doesn't change the fact that a Punch-Out stage is on the 3DS version. Punch-Out never had handheld titles, yet it has a stage on the handheld version.
Furthermore, Sakurai has said in the Developer Direct how this rule wouldn't be followed so strictly. He said most stages (and trophies) on the 3DS would be based on handheld titles, while on the Wii U version, more stages from home console games would be featured. Keyword here is MOST, which is certainly not the same as ALL. Majority doesn't mean entirety.
In other words, once again, people are misinterpreting things and blowing them out of proportion.