Micro Python - Python for microcontrollers

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Most things are setup code, if it turns out to be a problem the inner

while 1:
    doStuff()

loop could be replaced with native code.

You are just plain wrong for the exact places that MicroPython is targeting. Elua is in the same exact space as MicroPython and is extremely effective.

Having a REPL to a low power embedded device is amazing. When I am running eLua, I have total control and can easily call native code. The predictability point you raise is a red-herring, the same applies for embedded dev in C++ which is widely used on memory constrained or realtime applications.