>While this has historically been the case, Python 3.4/3.5 has really sped up adoption of Python 3, and from an open source maintainer, Python 3 is making large inroads.
If by great inroads you mean "around 6-10% in PyPI after 8 years of trying", then yes.
But unless it gets over 30-40% it's not anywhere near significant in my charts...
Also, libraries are slowly going to drop Python 2.x support and go Python 3 only.