That's what everyone said about DVD players at first too, but like everything, they go into mass production and will become common and less expensive.
I do agree that an average person won't need one for the computer, although when DVD's can no longer hold all the data that studios want them to hold, I'd expect DVD to be dropped and Blue Ray to become the new standard. Of course that'll take at least 5 years.
And then there is HD DVD ...