Quite honestly, eventually? Books will probably be something antiquated and treasured by enthusiasts and collectors, like… I don’t know, swords. However, we’re still a ways away from there, and intelligent humans still need to learn both systems academically, and should *enjoy* both systems personally while we still have the chance.

That said, I don’t think we’re at a point yet where it makes sense to abandon or even reduce print collections in favor of digital ones, except in a few specific cases where the digital version really has made the print equivalent obsolete (e.g., legal cite checking). But I don’t think that it’s impossible to reach a point where we decide the optimum collection is a hybrid that’s much less print-heavy. I don’t think we’ll ever go all the way to digital-only, and might not even get much more digital than we are now unless publishers decide it’s worthwhile for them (or unless authors decide that traditional publishers are no longer necessary).