Good point, but personally I am thinking about the future of clustered data analysis, and this seems to be a JVM world and Scala seems to be the language of choice. Flink / Storm / Spark etc.

Dask has that, and scikit learn is moving that way also. It even beats spark for out of core work on a single machine

Yes Dask looks good! It's definitely featuring in my "must consider" list, but I must also, for reasons of responsible planning, give a lot of weight to the JVM technologies, with all their corporate backing etc.