Blu ray... the new dvd?

I have been wondering, for some time now, about how quickly things have changed, technology wise, in the last decade. Especially in the distibution side, i remember when videos had to be re-wound to the beginning and then came the dvd which was a complete revolution, easy to use and in smaller cases when compared to the brick like videos. Now Blu-rays have been introduced and it seems that everything has to be replaced for a better quality. So, i was looking at the Guardian website and found this interesting article all about the change from blu-ray to dvd.