The big problem here is deciding when something is abandoned.
Old software is used by people with old machines or conservative upgrade policies (for example banks), so a file which is downloaded maybe 10 times per year could still be useful to lots of people who just never upgraded. If they ever need to reinstall, they should be able to get a hold of an old version which is compatible with their system.
Obsolete software (replaced by an upgrade or drop-in replacement) can also be useful to lots of people. Witness the browser bugs of the 90's which would result in no-upgrade policies even in the face of security patches because other software depended on bugs in a specific version.
So I'd say no, simply because there is no reliable way to determine whether the software is still in use. Absence of evidence is not evidence of absence :)