These points were all disproved long ago. The jack is a the same thickness as the display.
The reason is because BT headphones have a much higher margin, and need to be replaced every few years because of the battery (if not already replaced because they were lost or damaged).
It's just a dumb cash grab.
Already done. It's called Torrent Streaming and lets you stream-on-demand anything that exists as a torrent without having to torrent anything yourself.
A client that can stream these Spotify torrents with an interface that works like Spotify (low bar, I know) will be awesome, but also including a database to match songs to artists so users can send money directly to the artists they listen to will make it revolutionary.