Your experience and mine are antithetical to say the least. Almost everyone that I've played Vampire with has also played in my D&D games. I can't say that my anecdotal evidence trumps yours, but I also cannot see where your anecdotal evidence trumps my own. For good or ill, I've found that most of those people who prefer Vampire and other WoD games over D&D do so because they prefer the romanticized gothic horror genre over the heroic fantasy genre.
As to your attack on story-based gaming, and the mindset of indie-games goes I'd suggest you take a look at the film industry. Independent film houses also share this perception of the mainstream of their industry being fundamentally flawed, and the general populace sees this for the bull that it is. In order for your arguement to work, most roleplayers must be easily swayed and incredibly supid. Your lack of faith in other people to decide what works best for themselves is trully astounding.
Additionally, your over reliance on the words of Ryan Dancey suggests that you are not overly concerned with the whole of the roleplaying market, or even unbiased viewpoints. While Dancey was responsible for the OGL of which I am thankful, one cannot base an arguement of this nature on the words of one man. From my vantage point, I have not seen a drop in systems proliferation resulting from the OGL, but rather I have seen the emergence of several key players who would not be publishing rpg materials otherwise, AEG being the only trully notable exception that I have seen. We have recently seen Hero 5th Edition, Gurps 4th Edition, Ars Magica 5th Edition, The d6 RPG, the emergence of the cinematic Unisystem, the New World of Darkness, the return of Shadowrun, WoD 2.0, a new edition of CoC, and an upcoming new edition of WHFRP. The proliferation of systems is as widespread as it ever was, and that's fine with me. The kinds of arguements offered by Dancey in defence of TSR are reminiscent of a little boy caught with his hand in the cookie jar saying his sister ate all the cookies. If you want to blame any one for the decline of AD&D and thus the roleplaying industry, blame the ineptitude of Lorraine Williams and other TSR managers.