Seeing redesigns is an interesting exercise. But I don't see it being much more than that.<p>The author asked why companies have not done this. Believe me, 9 times out of 10, if it would increase their income, they would have.
The fact that they have not done so means that there are either business reasons to leave it as-is, or simply other projects that will have a greater impact on the business, and therefore a redesign is of low priority.<p>I've said this before -- just becase we care about web startups, that does not make every company into a web startup. Having a good web design does not always have a material impact on the bottom line of a business.