Beepster
Thanks for the confirmation on that. I guess at that point the only way to possibly resolve the theoretical issues is through quantum computing (which is like... wow man) and optic circuitry where light is used instead of electric current which although electricity technically moves at light speed is slowed down by the resistance of the conductive material.
Hmm. Interesting line of thought.
Off the top of my head, I suspect you couldn't solve it with light based computing, because you'd still be at the mercy of a conversion step, and that's where all the problems discussed really arise from; the conversion step. For example, the filter problem; that only matters in the analogue domain. We can make incredible digital filters. But unfortunately, we need to do the filtering
before we go digital, as the Nyquist theorem shows.
Beepster
For our humble sacks of mostly water trying to make pleasant sounding noise though really... it looks like we've gone WAY beyond what we actually need. In a very short time at that.
That, I'm certain is the case. If we want to make good sounding records, we're far better off focussing on rooms, mics, technique, and musicianship (whether technically flash or just instinctively cool-sounding).
In terms of the back end of pres, convertors, summing, and what have you, this stuff even at prosumer level now is way better than it will ever need to be.
And that's what always strikes me most about these arguments. Anyone obsessing over sample rate is looking in pretty much exactly the wrong place.