I like the idea but I think it should be up to the exchange/deposit entity to provide refunds if they screw up themselves. There should be a better 'reserve-system' imo. And how are you going to handle claims? Let's say for example that one just transfers his coins to another address of his and claims fraud? I can't think of a way to actually verify that his coins got stolen. The best solution atm is more transparency, reserve capital and to trust the exchanges that are doing good business. The bad ones will blow up eventually over time, but so will some of the investors money...
But I agree, we need more security/infrastrucure to attract more capital and trade. Will subscribe if I find the button...