Having worked with web components over the past few months, yes this. I can mix and match polymer, x-* elements, brick components etc with ease. I don't have to care how a given component is written or what its dependencies are. It's definitely the future.
I can drop a jQuery calendar into a React component with minimum fuss. I think the interoperability issue only comes with components from large frameworks.
Honest question - I'm a react newbie and one thing that isn't immediately obvious is how to drop a DOM-manipulating jquery library into a React component. I'm sure I'm missing something really simple here, but do you know anywhere that's documented by any chance?