If someone lost 8000 DVDs they did something wrong. Either buying really cheap media or storing it improperly. I have DVDs that I burned from ten years ago that still work fine. I recently moved a few hundred DVDs over to BluRay for the reduced storage space and only had a few files that I had issues recovering. The rest came across with no problem and that was with a mix of Verbatim (good quality) and Sony (not quite so good quality) media.
"Kill the Wabbit, Kill the Wabbit, Kill the Wabbit!" -- Looney Tunes, "What's Opera Doc?" (1957, Chuck Jones)