LJB
I suppose one issue would be any new sources being routed there after you freeze the bus. When you bounce and choose busses you pretty much do get the final bus version as a wav, which I do standardly for backups etc.
well, same applies to tracks. when frozen no changes possible so that doesn't break any concept.
coming to think of it all required functionality would actually be there since you can bounce any bus faster than real-time e.g. when you export. so it would be a matter of temporarily loading a bounced file and route everything that goes into the bus into nirvana.
but what's the benefit ... because muting/archiving tracks which feed the bus (as I said above) is actually not a good idea as it one tracks often feeds many buses (reverb, parallel compression, headphone mix, ...) and thus would totally change the way the song is played back ... and not being able to archive the tracks that feed the bus there is no benefit from freezing a bus, is there?
so are we back to a batch-freeze of tracks (parallel, not sequential)??? this would be the option that quickly frees up resources (as the summation at the bus is rarely very intense, is it?)