I think the EXPECTATION that DVD-A carries a multichannel mix, as opposed to JUST a high-rez stereo mix, will ultimately be it's downfall. SACD's are more reasonably priced, and have multichannel CAPABILITY, however - there are many more SACD titles without multichannel mixes than there are ones that doJudging by Sony's re-remastering of so many of their SACD titles in multi-channel, it looks like expectations for multichannel SACDs are starting to affect their efforts, too.
Regards,