30th of June 2024 is not 10 years away. RHEL 7 will be the last RedHat with python2 by default and it goes end of life in 2024.
Additionally; expecting them to properly support all the new features and manually creating (not backporting) fixes for issues is accrediting RedHat with having more resources than the reality allows.
EOL for RHEL 8 will be in 10 years and python2 in RHEL8 will be a fully supported package even if not installed by default. And I suspect that it is not only Redhat that will need to support python2 past 2020. For example, I guess Ubuntu 20.4 with EOL in 2025 will still have a package. So there will be upgrade and fixes for python2 just not from python.org.
Additionally; expecting them to properly support all the new features and manually creating (not backporting) fixes for issues is accrediting RedHat with having more resources than the reality allows.