It's an incredible stretch to extrapolate from WinRT and suggest that x86 Windows will disable running arbitrary executables anytime in the foreseeable future. Surely no one actually believes that Microsoft is planning to turn away the huge mass of customers currently doing that with Enterprise apps, random Shareware, etc in Windows 7/8 any time soon.
We aren't going to agree about the ad. I literally never saw it in Minesweeper until I went looking for it today, and it's clearly a generic CPM based display ad instead of something invasive based on your activity. Focusing on these nearly-hidden ads in ancillary apps seems like the pinnacle of bikeshedding to me.
edit: Not to say that your opinion is wrong or mine is better. I just can't get on board with all of the fuss I've been seeing lately about these ads. Having been using Windows 8 as my primary desktop OS for about a year, I never see the ads. I have to hunt for them to even verify that they're still there when another blog post pops up about them.