Snark is funny, but you're doing exactly what I said: commenting with the benefit of hindsight. Obviously SOME people, ENOUGH of the RIGHT people thought it would work, because Amazon existed, but I'll point out that books WEREN'T big sellers in those catalogs you speak of.
I remember when Amazon was founded. (Heck, I was taught how to order from a catalog in Home Ec classes). A lot of people found the idea cute. Laughable. Or maybe just naive. I mean, sure, you could sell SOME stuff in a catalog, but would enough people want to buy books that way? (SciFiFantasy book club ala Columbia House notwithstanding) And that assumed enough people understood these fancy "home computers" to order things. All with enough volume to justify the costs.
I mean, we're talking about a time when no one said "Amazon", they'd say "www.amazon.com" (WWW required when you said it!), and that's assuming they didn't say "H.T.T.P. colon. uh, is that forward or backslash?..." and so forth.
I mean, had the idea NOT been crazy, it'd have been done earlier. And when it was enacted, lots of smart people had doubts. Lots of rich people didn't try to get their foot in that door. All because there were very realistic doubts.
They just turned out to be horribly wrong and Amazon succeeded like crazy.