You’re talking about writable discs. Normal blue-ray discs have a much longer life expectancy than most other mediums including HDDs. Standards and manufacturing have improved too. Modern discs have a life expectancy for at least 50-150 years.

I have a collection of over 300 discs. 100 of them are 10 years or older. None of them have failed on me. And I don’t have a temperature controlled room or anything like that. A lot of HDDs have failed on me during that time.