mattcolville
Adventurer
O Rly? And what data might that be?
Gotta say, it sounds extremely unlikely, to me.
WotC did a market survey after they took over. As an employee, I had access to the data, though I'm not certain I was supposed to.

Market surveys of the scope they paid for are expensive, but they could afford it. It showed them, among many other things, how many players were still play AD&D and had never bought another book after the Unearthed Arcana (a whole lot).
There seemed to be a high degree of coincidence between people who found the results alarming, and people who dismissed the study as flawed. I have no horse in the race one way or the other and so until someone else spends that kind of money on another study, I'm content to assume that data was fine.
There were a lot of interesting things in that data, it was pretty extensive.