I am 7 minutes into the video, and Vlad Zamfir (developer of Casper) has already not underst00d that proof-of-stake has externalities
My primary issue with Casper is that it relies on transactions to form a consensus, however transactions are subject to consensus, which is a chicken and egg problem much more fundamental than this simple analogy sounds.
Proof-of-stake is self-referential no matter how they try to dice and slice it.
However, Satoshi's proof-of-work has also failed and is already under control of China's mining cartel.
I am moving on...
Monero's design has not solved these issues, but merely delayed them until Monero is popular enough for ASICs to arrive. The adaptive block size of Monero does not remain immune to a cartel of majority hash rate.