The fatal hit that DVD-Audio took was when DVD Jon cracked the encryption of DVD-Video. Because DVD-Audio used a similar encryption (CSSII), the format was delayed by a year while a new encryption technology was vetted and implemented. People don't realize how significant a delay this was; Panasonic was in the process of shipping DVD-A players to stores when CSS was cracked, and had to recall the shipments.
Anyway, by the time DVD-A was ready for release with a new encryption technology (CPPM) many manufacturers had decided to go to market with DVD-V players only. This split the market, with the majority of players being not compatible with DVD-A discs.
As far as marketing, remember, there were not many ads for Blu-ray until the format war was over and HD-DVD had lost. DVD-A had a competitor in SACD, and Sony Music refused to put out their titles on DVD-A (under corporate direction from their parent). It would be as if Warner Bros still refused to put out titles on Blu-ray.
Finally the labels don't have the budgets the studios have for marketing; we're much smaller.
As far as the Elton John's, maybe one day.