I don't really understand the politics surrounding Python, but I don't understand why they believe this could be "blessed" by inclusion into the repository.<p>Performance goals have not been met so far; it increases memory usage; PyPy is an alternative with more community support (if only because the typical Python programmer knows more Python than C++); and it makes the code much more complex, introducing lots of hard-to-debug problems, at a time when the developers already have trouble getting people to migrate to 3.x.<p>The 3.x branch does <i>not</i> need a reputation for instability.<p>(None of this is to say Unladen Swallow is a bad idea, or should be killed; but it should prove its worth first.)