none of the disks I have from the early 90's have any notable flaws. few of them have been treated like shit, which can be heard as minor skipping.
I once read that cds have a theoretical lifespan of few hundred years, but I wouldn't count on it. we'll see in a couple of decades, if the worst case scenario is true.
I've been thinking about opting for vinyl always when it is possible from now on.