[oblio]

Well, some people are bound to already installed interpreters. And those come with Linux distros. Many of which will be using Python 3 as the default for their 2014 releases (Fedora, Ubuntu, Arch). Plus these distributions are helping/pushing 3rd party Python developers to port to Python 3.

So 2014 really looks like Python 3 mass adoption.

[jzwinck]

In corporate environments basically nobody uses Fedora, really nobody uses Arch, and some people use Ubuntu. RHEL7 will be new in 2014, and it will have Python 2.7. We can expect RHEL8 to come with Python 3, in 2017, and the migration to that should be almost complete by 2021. I wish I were exaggerating.