Will Blackrock take over Ethereum?

https://www.youtube.com/watch?v=T3tkmTByWIg

Matthew Kratter is making some fair points in this video.

If big institutions can borrow from central banks at less than 5-6%, and stake ethereum for that percentage, they can basically take over the blockchain. With proof of stake they also have the power to validate and vote.

Honestly this sounds horrible, and I'd love to hear some rational arguments why this would not happen.