Decentralized systems are complex organisms. Hence they follow a different set of "rules" as compared to centralized entities.
That is why they tend to be haphazard and chaotic. Now we are dealing with a form of selection. We cannot dictate what people will be drawn to or what breakthroughs they will present.
Web 3.0 will be an underlying component of everything in my opinion. There still will be other models built on top though.