iPods had an 82% share of the US market at the time the term was first used.
https://www.theregister.com/2004/10/12/ipod_us_share/
At the time a “broadcast” to you iPod made the name podcast pretty understandable.
And there’s not much else I could think of to call it given technology at the time.
MP3 player was the generic term. But MP3 cast feels clunky.
I did hear audioblog used. But they weren’t all blogs.
It really comes down to the fact that at the time everyone knew “pod” meant “iPod” and that’s it.
Are they bringing back the headphone jack?
My Nokia should last until 2027 with updates but it would be nice to know my options if it breaks.