If if I may propose a summary of the discussion so far:
- the python.org downloads and Windows pages should recommend the 64-bit installer over the 32-bit one, so that people don’t use the latter by mistake
- there are genuine cases for a 32-bit Python on Windows, including embedding in 32-bit applications and linking with 32-bit ODBC drivers
- developing and testing on 32-bit Windows is not significantly different from developing and testing on 64-bit Windows: if you can do the latter, you can also do the former (even in the same 64-bit VM, probably)
- 32-bit platforms in general are not going away soon, so Python will still have to ensure general 32-bit compatibility even if it were to drop 32-bit Windows support
- the cost of supporting 32-bit Windows specifically is probably not very high for CPython
Which, IMHO, brings the final question: what good would it do to downgrade 32-bit Windows support to a lower tier?