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 :)