I just doubt there are enough people who actually care though.

As a small example... Right now you can chat securely online very easily (using Pidgin with the encrypted add-on) and yet the majority of people continue to use programs like Skype or Yahoo, even after it's been shown how these are monitored and logged.

So if people can make simple changes to secure their privacy and don't bother, why would they make more complex ones such as buying and using cryptocurrency?

As sad as it sounds the only people right now who are really interested in Darkcoin are either privacy nuts or drug dealers. The general public don't even know about it, let alone have an opinion formed. And for the cryptocurrency they do know about (basically just Bitcoin), they generally don't care enough to learn about it or buy it.

The Snowden revelations should have dramatically changed how people go about things. Unfortunately it has not. To me that's a clear indication of how seriously people take their privacy