I think the point is more that by using web components, whatever framework you're using becomes more interchangeable. Web components only solve a piece of what, say, React does – the component piece. For state management, you can still reach for Redux (which tries to be framework agnostic), or even still embed them in React if that makes sense for your app.

So maybe web components won't stop framework churn, but they'll make it a lot easier to transition between frameworks.