Yes, I brought up the POS in my article and at the end I talked about the tokens on top of the network, or ICOs, and I have current investments in both. However coming from a background in Bitshares, I have seen similar arguments made. In particular I had a friend who was an advocate and lost a large majority of his BTC in Protoshares and Angelshares. He refused to look at the concerning aspects because he was drinking the kool-aid.

I think a major flaw of Bitshares was the development centralization, when the developers wanted something done, they did it without real concern to the original bargain made with the founding investors. This will be somewhat true in Ethereum as well, POS centralizes the power to make decisions, and the older developers have a ton of ETH. Your mention of a third split also somewhat shows this problem IMO. What ever the devs decided to do in Bitshares or in this case Ethereum will be done to the developers liking. Additionally lets say that the development was completely agnostic, the POS system will allow and attract wall street or other bad actors to take over a POS system.

Your video also mentioned comparing it with gold, visa, and financial instruments. I think that it's centralized control, lack of privacy, and uncertain safety will be a huge barrier to overtaking current cryptocurrency alternatives for payments and store of value. I enjoy the discussion, and hearing your viewpoints.