I like Nim very much, however I do not think it will solve the 2 language problem. One of the things I lean on heavily in Python when experimenting and researching is the dynamic nature of the language. I believe this is also a strong factor for others.

For me, Julia completely addresses the 2 language problem. In practice I think it now simply needs a stronger ecosystem, better static analysis, and bug fixes, but I am very happy with the language design.