I own quite a few music CD from the early 1980's that fell apart, and heard the same of some very early DVD's not that I have seen any first hand as I remember.
I would hope that what was learned from CD's and DVD's will go to help, but that is not always the way it works
What I would do, I am still in two minds about Bluray I almost got one the other day but still can find too many reasons just to wait it out ...sorry, is get a named brand that has some sort of guarantee. Say like a Verbatim and their life time warranty with DVD/CD media, that if something does go wrong with the build of the media it will get sorted. You get a new disk, but I also feel that it must have a better build if the maker has that faith in it.