Libraries and legacy code are an issue, but if the Julia ( http://julialang.org/ http://julialang.org/ ) folks manage to deliver most of their promises, Julia m

Libraries and legacy code are an issue, but if the Julia ( http://julialang.org/ http://julialang.org/ ) folks manage to deliver most of their promises, Julia might cover a lot of the data processing needs (and is faster than Python), for which people use Python + NumPy at the moment. And the main reason some scientist migrated to Python is probably that Matlab is non-free, and the language of Matlab sucks. Julia might attract both Python users and future Matlab refugees.