It will never happen, the pypy codebase does not lend itself to the sort of quick evolution and extensibility that CPython delivers. Remember, the original goal of pypy was not "speed", that was a side effect.

What was the original goal of PyPy, and have they delivered on it?

The original goal was to implement a runtime that could run multiple languages, similar to Perl's Parrot project, but targeting Python and written in what was basically a subset of python. It so happened that the resulting implementation ended up being very fast in some situations, the commercial world adopted it, and the project basically pivoted to being "the fast python runtime".

The original goal, if there was one, was Python implementation implemented in Python. This goal is achieved.

The versions cant really merge, there's runtime differences and you don't want to bloat with two of everything

I think the GP could be referring to PyPy becoming a replacement for CPython (or incorporated into CPython) as the canonical Python interpreter. It could theoretically happen after for a major release, and it could work out to be beneficial, though I think it's quite some time away if it happens at all.