IMHO the best chance to become successful on this way have Litecoin foundation) They bought part of the bank and trying to make a gate to real world. But already there some working products like epayments, PAy, Monaco. As I understood they all have some problems with regulation. IMHO we should for regulation from G20 to get real secure gates to fiat.
This is the problem so far. Regulation of the government. We can not do anything if government does not allow cryptocurrency to be used as basic payment to buy basic. This is not from the cryptocurrency is not ready but from government. There are some project is ready but no regulation is nothing.