I think Blu-Ray has the potential to kill HD-DVD as a viable movie format, just like Sony's 3.5 inch diskettes replaced 5 1/4 inch floppies eventually or CDs virtually pushed Philips' music cassettes out of the market. But I think Blu-Ray will not kill DVD as a format for many many years to come.
I do wonder why everyone seems to speak exclusively about Sony when talking about Blu-Ray disc as if they are the only involved party, sure they may have probably the best units available on the market today, but Sony is just one of many consumers electronics companies focussing on Blu-Ray right now (unlike HD-DVD which is supported by only Microsoft through their XBox 360 console and Toshiba). Consumer electronics companies pushing for Blu-Ray include Hitachi, LG, Mitsubishi, Pioneer, Sharp, Philips, Samsung and Panasonic!
