Check out the lucid article on sampling rate by John Siau, Chief Engineer at Benchmark Media Systems, Inc., maker of audiophile and pro audio digital equipment (including the Benchmark DAC2):
http://benchmarkmedia.com/blogs/news/14949325-high-resolution-audio-sample-rate?utm_source=Application+Notes&utm_campaign=72152862aa-
I skim-read, but he seems to be happy to settle for 88KHz.
If I remember rightly, digital pioneer JJ suggests that around 60Khz would be best. Again, IIRC, Lavry also talks of an optimum, and so does Monty. It is not that
higher sample rates is bad. Or good. But that there is an optimum, beyond which, for various reasons, more is no better, and may be worse.
Neither the music industry nor the hifi audio industry (obviously both have to world together, not only in the name of
music for fun and profit, but also so we can actually play the music) has taken any notice of
optimum. A nice, trendy-looks-digital sequence of 48, 96, 192 and so on, looks much better to the marketing guys. 96 looks better than 48; 49 doesn't, whether it is or not.
Because of the numbers game, music/audio faces the worst period in its history: huge investment in manufacturing and huge costs to customers. It suits the marketing guys. The real engineers, rather than those who are on the leashes of their marketing men, must be truly sick.
He puts an awful lot of stock in the audibility of frequencies above 20kHz, ignoring the fact that most people have to amp things WAY up to hear anything up there. If there are arguments to be made for these high frequencies, they probably need to look beyond the ear.
I don't see why 44.1 should be set in stone. I hear that I don't hear over 20kHz (in fact, being a bit old and a bit more deaf, I personally hardly make it into double figures) but I also hear that there are, or may be, engineering benefits that arise from higher (but not ever-increasing) sample rates. If it is easier for the engineers to bring us 20Hz-20kHz at sample rates of 48, 60, or even 96, then let it be so, but lets stick to the technical and engineering realities, not the night-and-day differences that are caused by spending money ...or that might actually be there, but be caused because the DAC doesn't treat the sample rates equally.
I'll settle for the guys mixing the stereo up properly: please, my ears bleed when I hear stereo, and with mono, it sounds stale.
... ... ..
And I'll settle for properly-mastered music, an end to "loudness-wars" compression ...and proper research into whatever the next generation of better music recording/reproduction might be.