Please. What's the actual scenario you are envisioning here? Do you really, honestly believe that a jury is going to conclude that Nintendo is no longer the rightful owner of a trademark on Mario? Because they didn't take legal action against a C64 port? And what copyright are you talking about anyway? I thought this was a discussion about the Mario trademark?

This "you have to defend your IP" nonsense very quickly veers into propaganda in my estimation. Stated better here: https://www.eff.org/deeplinks/2013/11/trademark-law-does-not...

There is no realistic timeline in which the outcome you are suggesting comes to pass.