> Answer, because there was no convenience to be had with upgrading!
If anything, DVD-A was a convenience _downgrade_. People already had CD players (and upgrading to DVD-A would provide little-to-no audible upgrade anyway), plus you have copy-protection controlling acceptable output formats and preventing ripping.
Pop quiz hotshots, why did the CD become a big hit, but the DVD-A died a quiet death?
Answer, because there was no convenience to be had with upgrading!
The CD was a massive improvement of convenience over the cassette tape or LP record. Now you could instantly find the one song you wanted, and skip between them with the push of a button.
Similarly there is no convenience upgrade to go from MP3 to FLAC or some other audio format.
And the same pattern plays out with video.
DVD video was a smash hit because no more having to rewind that VHS, and they took up a whole lot less space on the shelf (buying a TV series season on VHS was downright crazy for the physical space it would require).
BR and similar is simply not enough of a convenience upgrade.