I second the point where people don't know how to function as a decentralized trading platform.
They expect someone, like a government, to put out the laws and rules for them and then they will start something.
Fully decentralized systems are probably difficult to achieve but a hybrid model has all the bright future in front of it. People just need to understand and assess their risks properly.
ARK - is a coin that could play an interesting role in the future as it bridges blockchains together - making for ways of decentralize exchange. i think we are going to see a lot more ways of decentralize exchanging popping up - which is great!