Earlier quoted context omitted.
I honestly don't believe that many will step up and take over. Many will complain, but few will do the actual work. Even if it's just security fixes, there's still the process of testing and release management, and honestly, I don't blame the core Python team for no longer wanting to do release management of both Python 2 and 3.
The biggest problem is having a place to organise. The Python foundation is threatening to sue anyone continuing something called Python 2, or even a similar name. Finding volunteers who are willing to get sued to work on Python will be hard.
They do have issue with people using a trademarked name and not making it clear that their work isn't endorsed by the Python Foundation.
[1] https://www.naftaliharris.com/blog/why-making-python-2.8/