In an interview Sony gave to AV Watch recently, the company admitted it's going to "gradually end development and production" of recordable Blu-rays and other optical disc...
25GB and 50GB disks written at blistering 10MB/s in the age of 100MB/s Gigabit Internet connected to storage (S3, Backblaze, etc. etc.) means that networks have completely obsoleted Blu Rays.
I'm surprised they still found a use of these things. Flash drives are also so much cheaper, faster, and more convenient.
I know for some secure purposes they still use CDs because they're a lot harder to sneak around than a flash drive. There are still some uses, but they're very niche. There's essentially zero purpose for personal use.