Given how much Google lives to mash their offerings together, and then sunset them, I live in fear of them killing Google Youtube Music (or whatever it's called), in favor of combining functionality with this, and having my music cycle between my actual library, and bespoke AI-generated stuff.
If I were a PM at Google trying to connect those two products, the far more obvious approach is the end of the creation pipeline having an "Upload to YouTube Music" button.
YouTube already hosts significant factories of programmatically generated music; just look for Creators with the 3-hour or 10-hour or livestreams. For YouTube Creators, and also for Photos editors (that's everyone with an unrestricted Workspaces account), they provide a menu of background music that is "royalty-free" and so you can attach it to a montage or your own videos, to avoid awkward silences, or set the mood to vaguely sorta what you were hoping for.
So it's an evolutionary step in my view, rather than a revolution.