It is an absolute fact that having a DVD player helped drive sales. All features do. It is debatable how many sales occurred that otherwise would not have. But, it is not debatable that the number is greater than zero.
I tend to agree that it probably wasn't a huge factor. But, if you're trying to justify the purchase to yourself, or your wife, or whoever, and you can say "If I buy this thing for $300, we won't have to buy that other thing for $150", it becomes a lot easier to justify.
Also, it should be noted that the OP mentions the low black friday (and other) sale prices of DVD players, but does not mention that the PS2 was also frequently discounted and bundled. Discounts, at least in the US, happen on almost all products, almost all of the time.








