Official support will be dropped by 2020, by then you will be relying on the community (who ?) to provide bug and security fixes. I'm not aware of anybody stepping up and declaring they will take over maintenance.
At this point, insisting on python 2 is the ideological "side". There's no practical nor realisitic reasoning behind it. Major parts of the community are moving to python 3 and dropping python 2.
You can stay with python 2 and maintain the language / libraries, but don't begrudge those that move on.
I've plan to migrate away from py2 by 2020 too, just not to py3.