Not arguing this point at all. But there really needs to be more legislative work done around the concept of abandonware. In the assistive technology world there is what amounts to tons of this stuff. IBMTTS being a synthesizer that there appears to be no legal way to use anymore as IBM has abandoned it (and, in fact, it sits on an entirely open server just begging people to download it, gratis). No amount of trying to get IBM to license it, or even acknowledge its existence, has gotten any response for years now. Yet it remains a favorite synthesizer in certain segments of the AT community and has a couple of distinctive characteristics that make it so.
Having software that is "readily available" from many sources, which is no longer sold, and which is no longer maintained by its originators be "untouchable" by anyone else makes no sense whatsoever. Much like patents run out and copyright on books run out (though over a length of time that would be ridiculously long in reference to software) we need to have copyright run out on abandoned software. Such does exist, and anyone reading these forums knows such does exist.