This is incorrect. BD cannot put a DVD on the same side. The BD camp and JVC gave up on doing so about a year prior to launch due to the yields being abysmal, the proposed linked technology just didn't work on Blu-Ray. Note your article is from 2004, and that is the reason you haven't heard a peep about it since.
So, if you want DVD and HD on the same disc, HD DVD is your only choice.
Are you sure? I can't find anything about poor yields or that the combo disk has been abandoned. The only thing I can find that JVC dropped is their Bluray HD-DVD combo player.
JVC is working on a 50GB Bluray + 8.5GB DVD combo disk (
http://ezinearticles.com/?JVCs-First-Three-Layer-Combo-Disc-Blu-Ray-/-DVD&id=16518 ), and given that MPEG2 is being pushed for Bluray movies generally, JVC may have dropped the 25GB + 8.5GB in favour of the 50GB + 8.5GB disk. Also since production of 50GB Bluray disks started only recently, the focus for media manufacturers like JVC must be to get 50GB disk production ramped up to meet demand.
Of course Bluray could possibly do a double sided combo disk like HD-DVD, but single sided is better if you can do it. Bluray can do a single sided combo because the Bluray layers are much shallower than the DVD layer, whereas HD-DVD can't do this because they are at the same depth.
I am a bit sceptical about some of the stuff being put out by the HD-DVD supporters - I remember the same thing was being posted here about 50GB Bluray disks not being feasible. It is clear there is an element of fanaticism among HD-DVD supporters.
Only one or two weeks before the 50GB Bluray disks were mass released, they were ranting on about how the 50GB Bluray disks had technical problems and that the yield was too low for production to ever be feasible. That was completely debunked.
Before that, we had those who latched onto poorly 25GB MPEG2 encoded Bluray mastered disks and the first release of the Samsung Bluray player with faulty firmware, and ranted on about how Bluray was a disaster and would always be inferior to HD-DVD. That idea has been thoroughly debunked by properly mastered Bluray media and updated firmware and independent reviews subsequently. However you still have the same rant by posters on this very thread.
Why the fanaticism? Why the need to declare that HD-DVD has won, when the battle hasn't even started yet? The only reason I can think of is that if you have got a short head start, but are likely to lose the format war, you need to push any early advantage and declare victory before your opponent has a chance to get started.