Hatsune Miku was deliberately gamified as participatory marketing for creators, and is also representative of a specific culture.

You can't generalise to pop in general, because being a pop headliner is as much about glamour, lifestyle, fashion, and branding as it is about music.

No one wants an imaginary Bowie album, because it's a glamour-free proposition - a curiosity at best, most likely irrelevant.

People have been trying to make an Idoru for decades for now, and they always fail. You can only sell fantasy and identification when they're implicit. When you try to attach them to an artificial marketing concept it becomes impossible to suspend disbelief and make the fantasy stick.

Even when it comes to vocaloids like Miku, there's still attachment to the producer behind the song and not just Miku herself (and several producers have gone on from their vocaloid careers to launch "real" music careers).