For most people, the privacy aspect will be adequately covered. But it's not that hard to imagine the scenario of a potential altcoin adversary spreading FUD about DRK's operation with master nodes in order to promote their "superior" solution and how they "solved the problem".  

As I've said, if digital currencies have a worth of 10bn market cap and one percent goes to anonymity, it's 100mn market cap. That's a lot of money right there and it won't be distributed without a fight. If we assume ten percent transition from the transparent to the private/anonymous market, that's one billion. Too much money for "kindness" between market adversaries that are competing for this billion: Every weakness of Darkcoin will be highlighted as to why it shouldn't be the leading anonymous cryptocurrency but rather why some other altcoin should (to get a better position so that more of the flow of money towards the private/anonymous market can end up to them).