This is fine if all you care about is functions. Very little in Python is just functions though, and the same is true in C++. The issue with FFI is always adapting the different concepts from one language to another. I can't see how (or if they try) to unify other language's OOP with a functional language over the top. I like the idea though - one functional language to rule them all is a great dream!
As the morloc developer, I can tell you OOP support is in the pipeline (and there is some support now). A proper reply to this comment would fill a very long blog post, and I'm currently on vacation, so I'll have to get back to you later.
It's cool to know that there are plans for it. I look forward to hearing about them when you get there.
Enjoy your vacation!