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The PDF thing is why I vaguely alluded earlier to it not being a good idea to rip off a currently-available product (even if just via PDF). Anything that harms sales of earlier versions of D&D could be seen as a threat. Things like OSRIC have probably existed too long now to take action, but I wouldn't be surprised if they were hit with C&Ds (or 30-day OGL noncompliance warnings where applicable) if they were released today.
I think you are right about the above, although I think WOTC would like to kill the current OSR retroclones by competition instead of litigation. Why bother with Labyrinth Lord when D&D B/X is available? Why with OSRIC with 1e & 2e reprints (likely in pdf when it goes out of print)? What if the basic form of D&D Next is also fairly close?
Of course, some like Castles & Crusades and Adventurer-Conqueror-King System are really well done according to your focus and preferences.
I would still bother with Swords & Wizardry because OD&D is really badly written and edited. EGG freely admitted it was more like alpha/beta run, yet there are still people happily playing it.
Many are simply dying because there is so little support with adventures. 3e/PF is really the major elephant in the room with lion's share of the RPG gaming market with Paizo creating the perfect storm of support in combination with other 3PPs.