There’s a bit about this in one of the later chapters in the book. I defnitely think the future will be all about small modules that do one thing very well, rather than huge monolithic frameworks that try to do everthing. This will definitely be easier when the module pattern from ES6 gets adopted.
You could even put lots of different modules together under an umbrella namespace using something like Ender or a build process, effectively creating your own custom bespoke framework.