fitzj
When will this get replaced with more modern sounds?
What do you mean by "modern"? The GM format dictates what instruments they are, so do you mean cleaner-sounding? More realistic? If you're looking for "top of the charts" or synth-type sounds, you won't find them in a GM module.
The challenge here is that TTS-1 is a free GM instrument and for its intended purpose, it works just fine for most users (other than the 96khz issue). If you're looking for something better, there's always Halion Sonic, Sampletank. AIR Structure, Korg Legacy Collection, etc.
Of course, if you leave rompler territory and look at specialty libraries, there are much more realistic and expensive options.
I'm not knocking your suggestion. I just don't see how realistic it is to expect Bandcamp to license or record a new sample set for a free GM module.