Abandonware refers to computer software that
is no longer sold or supported, or whose copyright ownership may
be unclear for various reasons. While the term has been applied largely to
older games, other classes of software are sometimes described as such.
So the recent actions of Wizards of the Coast creates a situation very similar to Abandonware. They are no longer supporting those games and they no longer make a profit off of them (though they easily could). Ryan Dancy (whose brand manager energy and foresight made 3.x a very successful game) makes the following point in the comments over at RPG Pundits Blog:
PDF? Causes endless problems with hardcopy partners creating pressure on
sales team they could really do without, and revenues are so small as to be
non-strategic. Cut it.
The revenues from the PDFs of old titles are probably considered non-strategic and thus we may never see them again. However, googleing D&D torrent will show that they are all over the internet, abandoned never again to make significant income for the copyright holder. Abandonware.