This is absurd scenario on top of infeasbily-expensively-absurd scenario. Google has no desire to do this, it would completely fly in the way of WebM's original

This is absurd scenario on top of infeasbily-expensively-absurd scenario. Google has no desire to do this, it would completely fly in the way of WebM's original goals. Further, the idea that YouTube could retranscode content in any sort of timeline like that...