The texture bug has affected more people than broken quests have. I'll agree broken quests are more of a problem than a texture issue but Bethesda are simply looking at the numbers. If 80% of Xbox 360 owners have the texture issue then it's a pretty serious issue, I don't know the exact percentage of people with broken quests but I know for sure it's a lot less.
The ETA for the patch is around 9am - 12pm GMT tomorrow, but that's just a rumor based off common update times.
I don't know anyone who has this texture issue. I know alot of people who can't complete several quests, including myself of course. Im no marketing expert or anything but I think everyone has had atleast a few quests they can't complete.
Make the game pretty after you make it work. I would bet more programmers are working on add ons to sell than patches. All about the money. That's why we are dealing with a massive amound of glitches and disappointments.