Another round of instant punditry. Warning of this speculation is very premature in the light of having no press releases from Wizards.
If the library of older editions doesn't return what does this mean for Old School Retro-Clones? I think first off it would be an loss of historical value. The average gamer would be no longer have ready access to the history of their hobby. This would be saddening in many ways.
The fact the older edition were available to be legally bought is a mixed bag to retro-clones. One of the perennial arguments was. "Why buy Labyrinth Lord when I can just buy B/X on RPG Now." It was good thing because as good as the retro-clones authors are, one could just go straight to the source and bypass everything. Groups playing older games had a way of having new members get legal copies of the rulebooks.
If the older edition are no longer available then retro-clones now stand even more prominent in the Old School Revival. While not all the old PDF sales will go to the purchase of retro-clone I believe a good portion will. Maybe as high as a quarter depending on how long the unavailability of original PDFs lasts.
Ifeel even if the disruption is brief the fallout from this will cause some gamers to look for alternatives to Wizards and some of them will be looking at our stuff.
Parphrasing the old Chinese proverb "We now live in interesting times."