Good points slimz. That's why I touched on that when you look at it, the programs that change a lot usually are horrid. Just look at us in basketball, we have no "signature" basketball look outside the two-tone unis from the 80s, which is also when we were last very good outside Lon's little run.
USC and Miami are a programs that have tweaked their unis lately but still maintained their recognizable look. I think a lot of that lies in keeping the helmet the same. But you look at OU, NU, Michigan, Penn State, UT, etc. and most of them have looked pretty similar for a long, long time.
I agree with Rusty that this can turn into a pretty lame discussion, as in the thread he linked, but somehow it is kind of interesting to discuss. Go figure.