[oscardssmith]

I think Julia has a pretty good path forward since it is often faster than C++ (especially once you consider language interop overhead), and it is much more pleasant to write than c++. Since Julia and most of the packages are written in Julia (for the most part), Julia makes it really easy for users to become developers. Python and R have much bigger barriers to entry since users will usually hit a binary blob, which makes it much harder to interact with library implimentations.