Unlikely. Even if Google were to go hard into the video space (unlikely but not impossible), they still wouldn't benefit from throttling/capping. It would just give users a reason to go back to their original providers. Furthermore we've already seen the governmental backlash when facebook tried similar in developing nations.

*I should clarify when I say "the video space" I mean original AAA content like Netflix is doing. I could be underestimating them but that's a LONG way from their market sweet spot.