I sure would welcome a change like that, but knowing how Google works, false positives are going to be rampant! A few years ago, my main competitor copied & reverse engineered my entire site structure and I told them to cease & desist with their plagiarism, providing the archive from Alexa's Wayback machine to prove my point, but the competitor quickly blocked Alexa's archiver. I guess that proves he was guilty.
I wonder how Google will determine the originator of content? or if Google will use their own archive?