My personal dream endgame would be a dynamic language, such as Python or Ruby, that includes the concurrency features such as goroutines and channels
Erlang is dynamic and has all those features :-)
It's true that the GIL in Python prevents interpreter threads to run simultaneously. But for many use cases it's OK to use gevent or multiprocessing (which share the same interface!). Channels are there in the form of queues, but there's no built-in support for selecting from multiple queues. To emulate that, you need an extra greenlet for each queue.
Erlang is dynamic and has all those features :-)
It's true that the GIL in Python prevents interpreter threads to run simultaneously. But for many use cases it's OK to use gevent or multiprocessing (which share the same interface!). Channels are there in the form of queues, but there's no built-in support for selecting from multiple queues. To emulate that, you need an extra greenlet for each queue.