FWIW I literally just got my boss on board with switching last week. There are still a lot of stragglers who are stuck thinking that they're going to have library compatibility issues with Python 3.

I don't. I use pyenv and it's always just python, even though I have many different versions on my system.

Same with virtualenv, but without users of scripts using pyenv or virtualenv the shebang is broken if it's pointing to #!/usr/bin/env python. Many users of scripts aren't python developers, so they won't be using pyenv or virtualenv. Just wish we had a cross-platform way to run python scripts reliably like we did when /usr/bin/python always existed.