Users will have to erase their entire hard disk and re-install everything to switch to Windows 7. This video was weird because Mossberg was a huge booster of Windows 7 in January. Now [WSJ Mossberg] guy is providing a reality check.
... Apparently Windows 7 has changed enough so that you cannot drop it in as a new OS and expect it to run anything that has been previously installed. In the past, this upgrade-in-place was always feasible, although it was never as good as a clean install.
So we have a new upgrade low from M$. Having used Debian for nearly a decade, I'm sure I don't miss that part of the Windows experience. As the saying goes, "Some compatibility is more backward than others.""