You have got it in a nutshell. If it cannot be played on the move either Pod, walkman, or car it will not make it into the mainstream not that high end people want it to. More hybrid discs might be the keep it going answer but Sony doesn't seem to care about that and we are coming to find out because a disc is SACD doesn't make it better - case in point -the Stones collection.
Is SACD winning over DVD-A?
It seems to me like there are more high-end SACD players and more software. The obvious answere is a universal player but a number of manufactures have gone SACD. I still ask myself if these will both just sit on the sidelines. Most people can't tell the difference between redbook and MP3.. so what chance does either format really have. With DVD-video vs VHS it was something a kid could see.