In 10 years of managing 20+ UNIX boxes I had 3 crashes; all caused by hardware failure. During that same 10 years I probably had 30+ hardware failures with only 3 crashes! Its because of the OS's stability and openness that UNIX has remained so viable after 40 years.AWB
But I do not see anyone surfacing to the top with distro that will catch on. Last month Ubuntu...etc.
Unix is great. If you have something like say a CD rom goes out.... just "un mount" it.... open the case of the box.. take the old one out... stick the new one in.... close the box and "mount" the new CD.... Never shut the system down... no problem. Great OS