I wouldn't say worthless. With the amount of scrutiny, tracking, etc going into bitcoin I think every day legitimate users are going to start looking elsewhere. To solutions like DRK. Either way cheap DRK at the moment.
I think there is no room, for an illegal coin and an "legit privacy" coin.
And experience shows in IT, when its about privacy/security, there is no split between "legit" and "illlegal" users or services.
E-Mail-Encryption e.g is to 99% done with PGP, by legit and illegal users, there no two solutions.
Disk-Encryption e.g. TrueCrypt is the leading standard software, with 90% market share and its used legit and illegal users, there no two solutions.
There is only dominanting "Dark Net"/"Dark Web" (with an active scene) on the internet, with TOR and not two big ones, one for legit users and one for criminals.

Or just look at IT-security: good guys (IT-Sec consultants) and bad guys (hackers) use the same pen-testing/hacking-tools.
Another example: are Bitcoin-Mixers, which are used users from both "sides".
So for me it's obvious: there will be only one big active privacy coin, with enough users, eco-system and developers.