Blender has been on Py3K since 2008 and is an underrated software platform.
Asyncio is a revolutionary concurrency framework based on coroutines. The "yield from" feature is useful both for coroutines and for other generator functions.
Python 3 is happening, and that's the reality.
Unfortunately, I think what this means is definitely up for debate. Python3, "happening" may be nothing more than a permanent split, not the obsolescence of 2. In fact, that's what it looks more and more like everyday.
What IS happening, is that libraries are not, will not, and cannot drop 2.7 support. The opposite isn't true and may never be.