Bootstrap solved a big problem: have a developer create a modern looking website without needing a designer. Looking at the mentioned "Web 3.0", I see patterns

Bootstrap solved a big problem: have a developer create a modern looking website without needing a designer. Looking at the mentioned "Web 3.0", I see patterns that Bootstrap can pickup and evolve into having over time. For example overlay elements and grid cells. Designers will continue evolving the look of the Web. Bootstrap (and others) will continue picking up patterns and incorporating them for developers to implement without a designer. And that's a good thing.