"Our own real-life computer tech has gone from vacuum tubes to paper punch cards to magnetic reels to optical discs to you name it. And that's only in decades."
You make it sound like optical discs are part of this progress / evolution which they are not necessarily.
It is my understanding that programs (e.g. DVD masters) are still being archived on digital tape because it is the more reliable medium with longevity.
And for films I've heard they are seriously considering (or already doing it) conserving it on conventional camera negatives because, again, it is the more reliable storage medium (but I'm sure Maxwell Everett could tell you more about these things).
So it's not over for digital tapes, yet.