Explosion of music (1000x more high quality music). The best will be decentralized, not white label produced by Spotify. 

Spotify will either resist out of respect for human artists, or embrace. 

If they resist, a new platform will replace them. If they fully adopt, I think their business improves.

However, their advantage may be less enduring. 

Their advantage is distribution and integrations. All the record label dealings will be obsolete. 

Another platform with better music/personalization could still displace them, as distribution via app stores is comparatively easy.

Maybe Elon Musk will have to take over Spotify, force them into product velocity, and set the AI music free.

Historically, companies aren’t good at making such aggressive pivots, which makes it somewhat likely they’ll fail to shift. They haven’t shown extreme product velocity/experimentation. But they’re smart. Unclear.