Like you said, "failure" is relative. "fixing" denotes a broken product, "improving" would be a better word. Updates aren't a bad thing, everyone else updates their products, so why is "Blue" denoting a bad thing?
And Windows 8 supports touch via Modern UI and applications for it - however, it does NOT do so at the expense of anything, not even keyboards and mice. Touch-optional? That is a certainty, and something I haven't disputed - nor has anyone else. A touch-centric OS supports either primarily-touch or mostly touch, and to the exclusion, either partially or completely, at the expense of ANY other method. That COULD have been said of pre-3.0 Android, or early versions of iOS It is still true of iOS today. However, it is NOT true of Android of the 4.x versions (Ice Cream Sandwich and Jellybean) nor is it true of even WindowsRT.
Here is what IS true about Windows 8:
1. It is a true superset operating system. It supports touch AND keyboards/mice. It supports all the typical applications that Windows 7 did (and a large number that even Vista and XP did) along WITH new touch-based apps and applications.
2. Touch support is more obvious in Windows 8 - again, not in dispute. If anything is causing angst among those that don't have touch support on their hardware, it's that. Touch is still not only largely an option, it's still rather pricey on the desktop and on larger portables compared to non-touch hardware - for that reason alone, touch has to justify itself in terms of usability. Easier on smaller screens (where the premium is less or even non-existent) compared to larger screens (larger portables AND desktops alike).
3. One area where touch IS justifying itself is the *convertible* market - which didn't even exist with 7 or earlier. Another is larger-screen AIO PCs (another market that was a non-market with 7). However, both markets are far from the general purpose desktop or even portable market. Both designs are replacing traditional portable PCs and even desktops - however, because they aren't counted with portable PCs or desktop PCs, technically, they don't count, except as lost sales.
4. Tablets and slates - regardless of OS loaded on them, including WindowsRT - are by and large adjuncts to existing hardware in the developed world - seldom do they replace WORKING existing hardware. Along with smartphones, they have a subset of functionality of a PC running Windows 8 (or 7). In the developing world, however, such tablets and slates often DO replace an existing PC for one major reason - cost. And in a moribund economy, cost means more anywhere than it would otherwise.
5. Tablets, slates, and smartphones - regardless of OS - are able to do more now than they did with Windows 7, Windows Phone 7, Android 3.x and iOS 4. Changes in hardware AND OS changes are ALL responsible for that. All three are also more prevalent now as well - in both the developing world and the developed world. They still cost less than full-fledged PCs - even portable PCs. Therefore, if you are going to take a chance, it's easier to justify with a tablet, slate, or smartphone due to that smaller cost. (Big-time important in a poor economy.)