Also it's very nearly a pointless debate.
Global meat consumption IS going to increase over the course of the next century. This trend is already happening and it isn't going to reverse any time soon.
On the horizon of history, perhaps we will be able to lab-grow meat efficiently or there will be some global change of consciousness on the issue, But if we're relying on veganism to solve climate change, that means we're not going to solve climate change. The models we build MUST account for the increase in meat production that is going to happen just as surely as they already account for the increases in energy consumption that are going to happen.
I enthusiastically support anyone choosing to themselves go vegan for whatever reason, be it ethical, health, financial, or whatever. It's clear it is a lower-impact way to live and we should all strive to lessen our impacts. But Betteridge's Law of Headlines applies here.
I'll bet when I get to this video in my Nebula queue it is going to say much the same.