It could be released today. And it would be nothing like the event it was at the time.
It's not about the physical delivery format, but about the social rituals around it and the impact they make.
Streaming cheapens and commodifies music and turns culture into wallpaper. Likewise subscription video on Netflix, etc, which seems to have become a home for trashy potboilers about zombies, vampires, superheroes, and soapy post-apocalyptic dramas. Likewise Amazon's all-you-can-binge-on KDP for fiction readers.
Culture has always had the potential to be an event. In the past, the arrival of a stand-out movie, album, or novel literally left a generational imprint.
It's hard to imagine Spotify, Netflix, Apple, or Amazon, creating an environment in which that's possible. There will be products that have millions, maybe billions of fans, but there won't be many creative projects that keep the interest of those fans for more than a month or so, and even fewer - probably none at all, in fact - that will continue to have cultural power decades after their release.