There may be potential for an “opal-ember” project that makes ember more accessible to opal, but that would be outside of the scope of Discourse itself.
I’d be very interested in seeing Opal integrated into specialized areas of Discourse (such as theming), as an experiment. The goal would be to make these areas more accessible to contributors, thus driving contributions. This is in contrast with the rest of Discourse, which uses the complexity of the code as a barrier. Only programmers skilled enough to understand the frameworks being used are able to contribute, reducing feature bloat and increasing the quality of the resulting project. (Whether this was deliberate on their part or just happenstance, I don’t know.) Theming is one area where I’d like to see these barriers minimized.
Another reason why theming lends itself for this is because it’s something that’s currently lacking in Discourse. Limited customization is possible, but in the end, every Discourse forum looks alike. I’ve seen a few in the wild, and it takes a good 10 seconds tops to identify a forum as being a Discourse forum.
I’ve repeated myself a bit, but I think I’ve added some clarity.