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Agreed - I really enjoy writing Python but the more I use it the more I run into concurrency and performance bottlenecks. I think the big win will be moving away from the GIL but I image that to be a big ordeal.

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If the core developers have committed to remaining C-ABI compatible with py3 until 2023 then there's basically no way anyone could fix the GIL. It would mean breaking ABI compatibility on the garbage collector and the interpreter. I find this aspect of the proposal kind of disturbing since it effectively prevents anyone from even trying to solve concurrency problems in mainline CPython for another decade.

GIL isn't so much a language issue as an implementation issue, and (as is the case with Ruby and MRI's GVL), I expect that the solution will be found in an alternative implementation (which may later become the mainline implementation), rather than an update to CPython.

In Python's case, my guess would be that PyPy will be the the implementation that makes this mainstream.

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