Let's look at an equivalent:
Daddy Bigbucks bought a Ming vase, certified by the Koumintang Government as a genuine historical artifact.
A few years later, Antiques 'R' Us started selling cheap plastic copies of Daddy's vase, using info taken from photos.
Then the Art for Everyone Society developed a 3-D print program for the same vase, available free on the internet. If you want your own Ming vase, just download the program to your 3-D printer and make one. Or you can just look at the pretty pictures on-screen.
Has Daddy Bigbucks' genuine antique Ming vase lost value? Not to the serious collectors of antique Ming vases, it hasn't. They wouldn't touch that plastic junk with your ten foot pole.
Likewise, a real first edition hardcopy book, properly cared for, will always have collectible value for people who want that. For people who just want the information and are content to read off a screen or use reams of their own paper...
Two different markets, two different mindsets.
Chuck (Occasional hobby author)