I mean, it's not like CPython 2 is going to disappear on January 1, either. You can keep using it. What you lose is a) potential security fixes (you might not

I mean, it's not like CPython 2 is going to disappear on January 1, either. You can keep using it. What you lose is a) potential security fixes (you might not care, for your use case) and b) the ability to use other libraries that are Python 3 only, including security updates to libraries whose Python 2 versions are no longer maintained. Using PyPy (or any other Python 2 implementation) definitely doesn't get you b and arguably isn't much improvement on a.