But let me tell you what the PoS part is in our current fiat system:
I get my salary in fiat. I save my fiat in a bank account for being used later. I might not need to hold 1tb of ram available and proof that i have it running, but i already proof that i trust my fiat because i get my salary in it. I pay with it, i save it.
I have a high stake in it. I also have systems/tools available to me for my fiat like banks and laws.
This is no different to what etherium proposes: For PoS you need to buy and hold etherium and you get etherium for doing so.
It is not some saving mechanism, it is a concensus mechanism. It ensures fraud doesn't occur and that more crypto isn't being created out of thin air. It is a way to incentivice node operators to act fairly.
If the USD had a POS system, I would 100% have all my money in it. but i can't verify the whims of the FED