Ethereum They may be able to build an anonymity (ring sig?) layer on top of their turing complete blockchain, however it might very well be much less efficient than a native ring signature currency.
Conclusion: Watch this space, but don't be too afraid of an Ethereum based anonymous competitor.
I saw an interview with vitalik buterin who mentioned monero using ring sigs and that they were very promising or something similar, he seemed more interested in it than like ethereum's gonna take it head on. Anyhow, cryptonote tech deserves to survive long enough to give ethereum a run for its money at least.
personally, I think both bcn and xmr could do with a lot more publicity to really get them going, as could cryptonote technology.. and it's not like ethereum's gonna be short of publicity anytime soon.