M.L. Martin
Adventurer
I'd notice that no edition of D&D has died immediately in the transition, although 2E-3E probably comes closest, probably because that's the only edition where all support was killed in one fell stroke. TSR kept 1E backstock listed in its catalog into 1993 (even up through 1996 for at least one Realms product) and had articles in DRAGON using 1E rules a year and a half to two years after 2E launched (163 or 167, depending on whether you count Oriental Adventures as 1E-specific).
Hypothesis: The OGL has not only made D&D unkillable, as many said it would back when it was launched, the combination of daring readings of it with the rise of the PDF market has made all pre-4E editions of D&D unkillable.
Hypothesis: The OGL has not only made D&D unkillable, as many said it would back when it was launched, the combination of daring readings of it with the rise of the PDF market has made all pre-4E editions of D&D unkillable.