Comment by higherpurpose

20 years is more than enough to monetize a game, and even most franchises out there (I very much doubt anyone will care about buying an "Angry Birds" game 15 years from now, or even a "Mass Effect" one). But franchises don't even need to be included in this rule. You can just take every game on its own. So Mass Effect 10 would still benefit from 20 years of copyright, while Mass Effect 1 will be in the public domain by then.