I don't know how many community members would actually be interested in this or not, as I assume the majority are Steam users. However, fans of DRM-free installers (who like to be able to back their games up) would like to have the opportunity to purchase the Fallout games again from GOG.com. The fact is these games were already on GOG back when Interplay had the rights, and were high up on the bestsellers list, so I believe Bethesda has nothing to lose by allowing GOG to put these games back into their catalog. (Plus those versions had some great bonus content with them.)
Maybe there is some bitterness from B towards GOG because Interplay allowed GOG to put the games up for free and GOG abliged. Another way to look at that is GOG was helping to get the word out about Fallout 4 by letting people play the originals for free.
In addition, if ZeniMax would allow GOG to release Bethesda's other classic titles - the Elder Scrolls games - and id's classic games, too - Doom 1 & 2, Wolfenstien 3D, Commander Keen, etc. - I believe those games would sell quite well.
Check out the wishlist to see the thousands of wishlist votes for these games to come to GOG.com:
gog(dot)com/wishlist/games#order=votes_total&search=fallout
gog(dot)com/wishlist/games#order=votes_total&search=elder
gog(dot)com/wishlist/games#order=votes_total&search=doom
gog(dot)com/wishlist/games#order=votes_total&search=wolfen
gog(dot)com/wishlist/games#order=votes_total&search=commander%20keen
18,000+ votes for Morrowind, 13,000+ for Daggerfall, 11,000+ for Doom, nearly 5,000 for Wolfenstien 3D, etc.