By the time blu ray started becoming popular optical media were basically dead already as a data storage medium so those aren't particular common either.
The only reason blu ray still exists is that you can't buy (as in: own) movies in a high quality format otherwise.
If the publishers got the sticks out of their arses and offered file downloads for purchase, I wouldn't see a single reason to buy a physical disk other than sentimentalism.
I bought a (nearly) 1Tb thumb drive for £10 last week and copied all my music onto it. I’m thinking of getting a few more for docs and other media and leaving them in my keysafe.