web3 is awesome but it's not the same as Web 3.0, "The Semantic Web", which is what follows from Web 2.0. Web 3.0 will have complex data structures designed for bots, to have more structured depth to the information they have to work with, to be smarter with the algorithms that will provide you with more effective information, a world that will look a lot like the world portrayed in the film "Her".
The decentralization aspect of web3 is something I am striving for in my app designs, but more about doing more in the client rather than at the server. The Semantic Web is definitely the more interesting thing- for instance LD-JSON and OpenGraph are really opening up possibilities for those building crawlers, and we mainly have Google to thank for encouraging websites to use it for powering rich search results. I hope they keep it up and the rate of adoption of these technologies continues to increase :-D
For my app designs, there seems to be requirements to do less in client, so that pages would load faster. I don't know does web3 or Web 3.0 help with that?