Hi Jeremy,
Assuming we can burn the info off the cd in a bit perfect manner (many programs can),then what you have is two mediums with the same data. One is a 50 cent piece of plastic that is prone to scratches, in a poor clamped transport that looses data and corrects for it, with some vibration in the horizontal plane. The other is a bearing, platter and read mechanism that is built to strict tolerances, extracts data in a perfect manner, and does not scratch like plastic. They have a lot less vibration because the industry has spent billions in R & D.
We need look no further than phono cartriges. A better phono cartridge extracts the data from the same record better, the data (the record) is the same.
So in the playback of that data, the dac is presented with all the data, in a more perfect manner.
You are probably correct about hi rez as we know it (SACD & DVD_A) won't last . Computer audio has a lot less boundries. 24/96 and 24/192 is fine if you have the hard drive space. Has anyone heard Wilson Audio's master recordings at CES. They are breathtaking!!! Why can't we pay more and get what we really want?