DVD became extinct when I purchased My Panasonic BD80, which was purchased on the promise by Blu-Ray promoters to enhance my viewing pleasure with a better picture. Since the Panasonic up-scales my collection of DVD's, that material looks better too, so good in fact that I don't really see (pun) a need to purchase BD material as long as the same is out there on DVD at a cheaper price. Maybe BD has better sound than DVD; but, not better as in a comparison of DVD to VHS.
Here's what's going to happen. Production of DVDs will cease, or they will be packaged as they sometimes are now with a Blu-Ray disc. Everybody will pay more, until volume, competition and greed begin to bend for the consumer.
One more thing to remember, technology is about products which are perceived to offer performance, convenience, or something of which the consumer is willing to part with money to get right now, you know, life-style.