Zerocash is the biggest news in cryptocurrencies since Bitcoin itself. Zerocash, or all anonymous cryptocurrencies as a whole, should become the largest piece of the cryptocurrency pie. There have been many new end-user features in cryptocurrencies since the introduction of Bitcoin, but none of those are as vital as anonymity. It doesn't make sense to tell everyone to use a mixer or a dark wallet, when anonymity could be built into the currency system itself. It doesn't make sense to say that mere pseudonymity is good enough because the goal is transparency (institutions adopting pseudonymous cryptocurrency), when there are people who would use the blockchain to exploit users. Maybe most people don't care about Bitcoin anonymity now, but most people don't use Bitcoin extensively and think of it as a toy.