PoS makes sense if these were investments. How does it help these become currencies? If it simply benefits those who hold coins, it would create artificially scarce environments where the price would go up.
not every investment vehicle is a currency. You dont buy eggs and milk with MSFT or GOOG or APPL. Nothing wrong with giving a dividend to coin holders, its the reward for taking on risk, and securing their respective network.
I keep hearing this "store of value" statement about various coins but would have to disagree. The reason GOOG or APPL have value is that they represent a portion percentage of an actual corporation that earns revenue. Gold/Silver/Metals have practical manufacturing uses which drive their value. A cryptocoin that simply has no function other than a "store of value" doesn't seem very valuable to me, just more hype and justification for the lack of marketing/development to make it a useful commodity.