Developers disagree on even the most trivial things, like the best way to parse a query string. What makes anyone think those disagreements will magically disappear once web components become a standard?
Sure, give us native APIs that allow developers to build web components. But even then, people are not going to be abandoning their preferred frameworks. Frameworks can change their internals to target the new native APIs, but on the surface, they probably won't change much.
Instead, the goal is (or ought to be) to create a native, app-directed API for creating and manipulating UI components. HTML and the DOM are a universal content format and API, and we need its equivalent for web apps (as opposed to content).
The web is a strange dualism between content and apps, and unfortunately, the app side has been forced to implement its constructs on top of an API that at its most fundamental level is built for presenting content.
 I like the diagram on page 33 of Jesse James Garret's seminal The Elements of User Experience: http://www.jjg.net/elements/pdf/elements_ch02.pdf