So many false statement in that paragraph. What you remember reading is the fact that blu rays are being adopted at a rate almost twice as fast as dvds, and 10 times as fast as VHS.
Or just google it, there's a thousand different news stories comparing blu ray adoption rates to dvd adoption rates. And blu ray sales in the four years since it's been introduced are VASTLY outpacing dvd sales growth their first four years as well.
As for the upgrade not being worth it, decide for yourself. Take a look at this comparison of an upconverted dvd to a blu ray on your MBP and try and convince anyone other than yourself that it's only an insignificant difference.
Edit: The above images were made into thumbnails by the mod here. So you must click on them to see the actual comparison of the images.
The comparison screenshots were done by zonadvd here...
http://www.zonadvd.com/modules.php?name=Sections&op=viewarticle&artid=736
Read the article too, it's absolutely devastating as to just how much better blu ray is as a format compared to dvd.