I have to jump in here and be a voice of reason (call me a party pooper but I've been around long enough to feel a buzz coming from far away). "Trigger happy" is the cowboy term that comes to mind when people make brave clairvoyant predictions like this. You have to realize that some of these concepts you are talking about have existed in some form (first theoretical, then different practical approaches to implementation). Creating a buzz will get you a few blog posts and likes but it won't change the fact that you're trying to oversell something I'm suspecting you don't quite realize and understand completely.
Let me roughly try to guide you trough the stages of a system (web based since you're talking Web 3.0 here)
The request response way of communication is the first and most optimal for usage when your system is small and you don't have that many users.
When userbase increases you start optimizing by maybe CQRS pattern. Most likely when you need to redesign your system around when you reach ~100K - 1M users This is when you maybe introduce orchestration and similar approaches as you might need to dynamically scale.
1M+ you start restructuring and redesigning to accommodate for the fact that you will need to split every step of the flow and decide based on operation how fast should you get it back. Most probably something event based, cached, scaled, using real-time signaling etc.
** 10M+ is around the beginning of a new stage of development of a system that is simply too big for one approach you have to further drill down each operation and the way it goes trough the system. But, the timespan you have is so short that you need to start making compromises. One of the approaches you could take here is go for a paradigm called "eventual consistency" and use event-store systems. THIS IS WHERE BLOCKCHAIN could come in as a concept. Eventual consistency is an approach where a lot of operations are event based and asynchronous. They are all over the place. Some mechanism has to make sure that they are all structured and that the order of operations is known. Again you could use blockchain but there are more efficient ways to achieve this.
I just simply cannot see why and how a consensus would be achieved in the web community and the governing bodies around www etc. would even suggest such a thing - forcing a very specialized concept on areas where we don't need them.
Hope this just encourages you to learn stuff more in-depth before you start making predictions and assumptions.
Good luck!