Right now, I think that Ripple(XRP) and Ethereum(ETH) are the only ones that stand a chance of replacing cash due to their heavy regulation. Though Bitcoin(BTC), NEM, Monero and Litecoin(LTC) (which is underevaluated, btw) look to replace cash, it is unlikely the the US & World Banks will allow this to happen.
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I really don't think they will have a choice. I think fiat cash will continue to exist but there is room for digital cash too.
A few more thoughts:
As regards Ripple, I don't consider that much of a digital currency. It's basically a bank account in the traditional sense, a little more distributed but still in the hands of the creators. I am still trying to get my head around Ethereum, is it a digital cash or not? Sure you can exchange it, but I see Ethereum as a type of economy whose ultimate value will depend on the ecosystem created on top of it, much more akin to company shares than to cash. I am still trying to figure that out though.