How is gluing a standard DVD to the back of an HDDVD actually a "solution" to the problem. I think saying that HDDVD had dual-format support is bogus, and why praise a dead format? You probably still pine for Betamax.
As for the Bluray dual-format, wouldn't it be cheaper to just include the regular DVD format disc with the Bluray disk? How does a dual-format player decide between Bluray and DVD (they have two lasers, right)? I can understand that movie studios don't want to give out two copies, but at 52% markup, they aren't really giving the consumer a very good deal.
And as for watching Animated movies on BR, is it really worth it? I watched Nemo on a relatives up-converting DVD player on a 61-inch widescreen, and it still looked pretty darn good.