It's not streaming that killed the iPod.
Sorry, but when you have a 20GB library like me, stream it over 3G would cost an enormous amount of money.
What killed it, is Apple not renewing them. If Apple didn't stick with a 6+ years old iPod Classic and had added flash memory or bigger storage on the iPod Nano, features like Bluetooth to the iPod Classic, the iPod business wouldn't be declining like it is right now because I can't be the only one with a 20GB+ library that wants a new device with enough flash storage.
I hear people saying "Well buy a 64GB or 128GB iPhone".
Well guess what: there's also people like me who prefer a device dedicated to music.
Yes, Apple do seem to have a habit of confusing their visions of the future with the here-and-now reality. I'm not sure why they're so convinced that every man and his dog now streams all of their music - my real world experience would seem to suggest that despite the growth of streaming services, everyone I know still stores their music locally. Unfortunately, such is (was?) the market influence of Apple that what they think will happen tends to become a self-fulfilling prophecy anyway.