re: Samsung Nixes Windows RT Tablet For U.S.
Actually, ARM may not be around for much longer depending on how aggressive Intel is with their push into the mobile market. They have a chip that performs better than ARM while using less power now. The rest is just marketing and hardware partners.
The fundamental problem with Windows RT is its inability to run legacy apps. I understand that's an architecture problem, but if Microsoft had allowed developers to write apps for the Windows RT desktop, it would've allowed devs to port a lot of their apps to WinRT and users would have more software available to use thus solving some problems of Windows RT.
Overall though, I think Windows RT is totally unnecessary and I think it only exists as a backup plan for Microsoft if Intel is unable to succeed in their push into the mobile market. Everything depends on Intel here. ARM has 0 advantages against x86 at this point. It's been proven time and time again that ARM is performs extremely poor when you attempt to scale it up (eg. ARM servers). However, x86, when scaled down, remains a lot more capable than ARM without sacrificing battery life of the device in question.
So basically, Windows RT exists just in case if Intel fails. The ARM chip is popular for now, but not for much longer. That being said, Intel is too slow in their push right now. If they take too long, ARM may catch up to the performance of the Intel Atom. At that point, x86 will lose its performance edge against ARM. Currently, the high-end ARM chips like the Tegra 3 have a performance level close to that of a Pentium 2, maybe a Pentium 3. Intel Atoms are currently just a notch above that.