This statement reads to me to be heavily hindsight biased.
CERN wasn't exactly a place filled with idiots, yet the article even says that Tim Berners-Lee's boss thought the concept was a little eccentric and only gave in because Tim Berners-Lee fought for it.
Unless you're saying the concept is simple? In which case yes, most brilliant ideas that are hard to have are made by elegantly combining things to make a "simple" result.
The really annoying thing about those ideas is you sit there and kick yourself thinking, "that's so simple, why didn't I think of that"
There's a very different possible future where he instead went private and sold it, and I honestly have no idea how to work out how successful the web would have been in that world.
A good chunk of the web's impact is it was how easy it was to adopt, so I doubt we would have seen as much success as we do see now, as one of the bedrocks of our current ecosystem.
We might even have seen a similar situation to unix and linux, where a theoretical proprietary web that was released eventually was rewritten in an open-source format, but with lots of fragmentation of the ecosystem.
If Ted Nelson hadn't been so obsessed with making it pay we might have had the web sooner. Whether that would be a good thing or not is debatable though as the Internet was not available when he started.
Sure, eventually it could have happened but it may not have happened for several decades.
In fact, the only surprising feature of www is that no one bothered to include bidirectional linking, to disastrous consequence.
The important thing for it to succeed was to have a large enough group of people using the same standards. That was probably a (very) hard thing to accomplish, and perhaps Berners-Lee played a large role in that?
I'm sure we can all think of cases where a core technology was kept private and eventually died in favor of an open version, the same would have happened here.
The article says it best "In order to succeed, therefore, it would have to be free"
If HTML didn't exist, would we still be in text-only ceefax/minitel style networks? Unlikely.
It was a perfect storm of hardware getting better (most people didn't even have computers capable of displaying VGA images until the early 90s!), networks getting faster and more ubiquitous and there being a gap in the market for a protocol that made us of these advancements.
So my point is if we weren't using the www, it wouldn't have taken long for some other protocol to take its place.
Maybe an apt comparison would be Amiga vs IBM PC compatible, the Amiga had better hardware, more features, etc. But the PC compatibles were open, anyone could build them, replace parts, expand them. PC won. And it wasn't even an open standard to begin with, they were IBM owned until they were reverse engineered into the PC standard we still use today. If CERN had released the www as a closed protocol, maybe we'd be talking about www-compatible today :)