Definitely makes sense if you are going for storage for decades, guess not old enough and too depressed to think so far ahead nor i have any pictures/videos I think as important
But personal disk will still be pretty relevant in future for decent amount of tasks where latency is important.
No matter how advanced the technology is, speed of light will be a limiting factor
Not being old enough or depressed enough isn't an argument to counter cold storage and is irrelevant.
By the time you feel you are "old and depressed" enough, the information will be gone forever.
Optical disks and tapes are limited by their physical interfaces. As @sriivatsava mentioned, the physical connections will be lost forever and it will be hard to find replacements over time. So storing it on physical devices does not make sense.
Personal disks will become like cache/RAM storage in future in my opinion, just holding enough information locally to counter the light speed issues when interfacing with the network.
So rather than RAM being as it is now which is caching local data in memory, I can imagine a RAM/cache for network storage.