Like Stealthcoin said; There is a major risk with a currency under Ethereum.
What Stealthcoin said doesn't even pertain to reality. There are perfectly valid and scathing criticisms of Ethereum, and what he said is none of them. It wasn't even about Ethereum... 
It sounds like Stealthcoin has mixed up ethercoin and ethereum because of the similarity between their names. They are two completely different projects and have nothing to do with each other. The link he posted is about ethercoin, not ethereum.
Quote
If you have ever wished cryptocurrency operated more like central banks, youre not alone. Well, you probably are, but that has not discouraged the developers of Ethercoin from introducing a currency that would make the central bankers proud. By creating a coin that operates completely on trust and gives developers nearly complete control of the network
https://www.cryptocoinsnews.com/ethercoin-raises-fundamental-questions-trust-altcoin-developers/