I am not an official developer, but I believe the answer is yes, both are deprecated. Chrome team has stopped working on both, so yeah, developers aren't really listening. And Chrome browser will stop supporting both.
However, the project is open-source, and the usages of NaCl outside of Chrome browser may still be supported by the community. I think this style of sandboxing is a fantastic project, and would love to support it, but in practice, there doesn't seem to be enough of a community, so don't count on it.
Dmitry