Great news. It has been long overdue and I secretly hoped it will happen this year. Now it is time to remove Python2.7 from gentoo: Heading from the official website

2020-09-28-python-2-7-cleanup
  Title                     Python 2.7 cleanup is progressing
  Author                    Michał Górny <mgorny@gentoo.org>
  Posted                    2020-09-28
  Revision                  1

Python 2.7 has reached its end-of-life by 2019-12-31, and many projects
have removed Python 2 support since.  During the last few months we have
been working hard to migrate Gentoo to Python 3, and we have finally
reached the point making it possible for the vast majority of our users
to run a system free of Python 2.7 packages (except for the interpreter
itself).
...

Yes it is called cleanup, but actually majority of gentoo-ers can remove python2_7 This is really great news indeed. Finally it is gone, and now even from my systems as well. 3 packages needed rebuild. GNS3 runs here only using python3. So python selection looks now like below: