First of all, there is nothing wrong with inflation. As demand for money goes up, money supply should increase. Deflationary and fixed currencies are not good for economy. Gold is a good example for it, we don't use gold today because it really isn't good currency. On the other hand, we don't want inflation like they do in Venezuela. A little bit inflation is good.
I see Ethereum network as Visa but unlike visa anonymity is baked in. Ether or any other cypto platform can keep on charging x% from all xacts and that could be the source of "interest" on PoS miners without any inflation.
Now, IMO blockchain is wasteful in comparison to Visa. 2 phase commit, traditional distributed xact approach, is much efficient consensus algorithm than distributed ledger so Visa has an upper edge here. On the other hand, distributed ledger is perfect if you don't want to rely on government authority as you want to create "global consensus". It is hard to foresee where this is going but at least to support illegal activities, there will be crypto coins. Up until last week, I was thinking that government can shutdown crypto coins but I just realized how impractical that would be. Government, like they do in China, can shutdown large miners but no government can kill a network completely.
I am kind of convinced now this whole crypto thing here to stay. And yes it is a big ponzi scheme but then most things are. USD is also a ponzi scheme. US government backs US dollar with its military and government institutions. But these institutions are formed bunch of people who believe in the US government want work for it and get paid by USD. They are the USD "miners"
I guess calling this crypto currency as "ponzi scheme" is wrong. Ponzi Schemes are created on networks that brings much less value to society than what they offer to the "miners". "A global and decentralized currency" is highly valuable proposition and of course early comers are going to be rewarded significantly. I thought US government would never let this happen but now I realize government has no control to stop this. I don't know which approach will work or when it will work but I can see the value or a world where crypto currency works.
Darn, not sure why it takes so long for me to figure out things
I just realized this while I am typing.