Vague gambling stuff - is this really going to be a 10x improvement over betfair who already offers solid p2p gambling markets with <5% house take?

Distributed computing rewards - maybe for a subgroup off applications (eg. illegal stuff eg. piracy), but in general terms a centralised system is easier, cheaper and quicker to develop

Replacing national currencies - this is already bitcoin's killer app. Ethereum adds almost no utility to this space.