Yeah, here's a couple of good twitter threads that sum up some of the issues with CurveCP (and perhaps ZeroMQ)
https://twitter.com/bascule/status/383364389576773632
https://twitter.com/jedisct1/status/381136544515375104
Lord knows if anyone is actually working on a protocol that fixes the issues mentioned.
If you're talking about Nacl, though, from everything I can tell Nacl is very successful and seems to have a pretty bright future. Certainly, I'd recommend Nacl over any other crypto library you might use to build a new system with.