You can have central DC supplies capable of handling power amplifiers, much less line amps. You can regulate your ridiculously stable DC at the target circuit using big transistors and heat sinks. Power supply impedances in the low milliohm range are no problem. Everything can be DC servoed, and you know exactly what the sources and sinks look like. Frequency response from DC to RF is very attainable, if you wish.
Pure performance is the issue.
The console as it stands now is designed around a card mainframe, with signal bussing along a backplane. This is suitable for high speed digital and RF circuitry, so it works fine for audio also. As a matter of fact, its good to consider audio designs as RF ciruits that usually don't carry the bandwidth, but are designed to. Its easier to get a transparent top end. There are other topics that will be covered here when I get a bit more time, but this gives a flavor.