From the Fedora project page that Lennart's article is based off of and links to in the opening paragraph:
"You are doing it wrong! /bin and /sbin are there to rescue a broken /usr!
The most critical filesystem is /boot, because the kernel lives there. So the purpose of having /bin and /sbin for /usr repairing relied on _two_ working filesystems ( / and /boot). If either of them was broken, you were not able to rescue /usr. The role of the rescue system can easily be fulfilled by a rescue initramfs. So having the rescue initramfs in /boot, which contains the fsck utils, is in the same danger of becoming corrupted as the kernel. Now you only have to pull out your rescue CD, if /boot is corrupted and not if / is corrupted."