Watched the video. The video is not about the long term stability of bitcoin, it is actually an ad for peercoin. But it is very infomative, some points are a bit shaky, and I learnt a bit more about PoS. Enjoyed the video, but still not interested in peercoin.
peercoin uses a flawed method of PoS and still uses checkpoints.
PoS should really mean piece of shit as opposed to proof of stake as it means now. That is what PoS coins and PoS both are.