No one is saying you can no longer use Python 2. The community is just saying that if you do, you're more or less on your own. Python 2 won't magically stop working on Jan 1 2020.
In the world of commercial computing, nobody can work on a language that is not supported. Essentially what they are saying is that companies need to scramble to port their code to Python 3 or risk running their systems in an unsupported language. This will in practice be just another hurdle that users need to go through to continue using Python.
