It will be some time before nation-states disappear completely. Probably 150-200 years.
Don't confuse Web3 with Web 3.0. The former is what we talk about when we talk about decentralization, tokenization, and internet money. Web 3.0 is completely different. That's the brainchild of Tim Berners-Lee, the creator of the World Wide Web. His idea was to create a semantic web (Web 3.0) where data would be portable across domains without a blockchain. As you pointed out, the invention of bitcoin and blockchain technology changed everything.