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What exactly is the plan?
You want older players to admit that d20 fantasy is D&D?
George Washington couldn't tell a lie, and neither can I.
You can disagree if you like, and I'll respect that, but (and I'm only using your quote as an example, Whizbang, this message is to the d20er's) why bother prosetylizing? The only time we ever bring this argument up, at least in recent memory, is either jokingly (to alot of overreactions) or in response to a question being asked. Was there some huge asault in the past by grognards on this website? Why, if even the slightest bit of dust is kicked on d20, does everyone get up in arms? IF you were to come to Dragonsfoot and do such a thing, nobody would respond to you. Yet here, folks get really hurt over any aspersion cast towards a GAME.
We're never going to agree on this, the grognards are on one side of the fence and the d20 fanciers on the other. Nobody expects you to admit that d20 is not D&D, you're not going to get the reverse from any of us. It's moot.