Prominent use-case of Ethereum is to create a new currency with new rules like ICO's. Decentralization is a myth remained in most discussions.

There's need for two important features in these currencies.

1. All participants should be able to validate the integrity of the ledger.
2. Ledger should be resistant to changes. Ultimate goal = immutable ledger

Instead of Ethereum I like the idea of each currency have their own blockchain with the above features.
In example of ICO's. All of them have issuer (owner). So it being public (mining/staking based) Doesn't make sense.
Also maintaining staking/mining based consensus is expensive.
Running a privately owned blockchain is the way to go.  And in this thread i did talk about how we can implement this feature in bitcoin in such a way to it would be very efficient to run (less expensive).
https://bitcointalk.org/index.php?topic=5120606.0