Campers and botters already killed it on my realm, I doubt a change like that would negatively influence it any further. Instead, I think such a change would probably make random scribes that wouldn't post thousands of glyph a day more common, which is probably what Blizzard would like to see too.

not the addon itself would kill it, a potential fix to break it would. When you have to post each auction individually, the work would be insane for 345 different type of glyphs. Therefore not many scribes would bother to do it and those who do would have to raise the glyph price a lot to make up for the work.

Remember the existing glyph industry will only be around for about another 12 days. 4.0.1

Hagu, what makes you think it's being turned inside out? You still have glyphs, you'll still have levelers, you'll still have competition, you'll still have campers, you'll still have herb farmers, all that might change are the quantity of actual sales (although I doubt it will be really that bad as you can learn more glyphs than in the past) and prices for the mats, the glyph industry won't change all that much as some try to suggest.