I am an SACD fan - partly because it is higher res than RBCD and theoretically offers better sound, and mostly because it is discrete multichannel music, which does a much better job re realism and 'being there' than 2 channel on classical music in my experience.
As always there are compromises; many SACD's have been mastered on PCM and then converted to DSD - it is very subtle, but I tend to find those recordings originally mastered in DSD to sound the best. I'd agree the differences between SACD and RBCD are subtle/small generally speaking, and I'm not sure that I'd pick the difference in a blind ABX test. However, multi-channel discrete audio is another matter, and if you want that, and I do, then SACD is the way to go. Despite being arguably a lacklustre success commercially, companies such as Pentatone are still recording classical music in M/C SACD and there are over 3,500 titles available worldwide.
Sony still supports SACD - ALL their current Bluray players will output native DSD over HDMI, or convert it internally to LPCM and output that over HDMI, which means any competent multi channel amp such as Yamaha etc will play it. Sony's current top ES receivers also support native DSD conversion. So it is not 'dead' yet, and there are rumours about a high res music disk that may come, based upon Bluray technology. Time will tell.
With SACD, ideally one would have a DSD playback system from disk to amplifier output for the highest possible quality results - which is what I have with an ES Sony player, coupling adaptive data rate transfer via firewire to an fully digital amp (Class D like B&O ICE power, but the pulse wave for the output transistors is generated from an DSD bitstream, not an analogue sine wave - hence it is fully digital like the similar Lyngdorf/Tact) and indeed these items are Sony flagship ES products, specifically designed for multi-channel SACD.
Nonetheless, to couple say a current Sony Bluray player outputting converted DSD to LPCM in the player, over HDMI to a B&O 8-40 and thence to ones active speakers would be a very worthwhile exercise in my view. There may be a slight loss of quality, but the benefits of multi-channel, discrete surround sound music would more than make up for it in my view, and again whether one could tell the slight loss of quality by the conversion from DSD to LPCM in a blind ABX test is debatable.
I am a B&O fan and hopefully a much bigger owner to be with Lab 5's on my agenda, and M/C SACD is a must for me, so I would certainly endorse and recommend any attempt to replay the medium over B&O equipment.
HTH
Best Regards
John... 🙂