I was similarly impressed when I was reading the documentation for Hystrix, which seems to share some functionality with Falcor, like request batching and caching.

The path syntax is very readable and obviously plays to JavaScripts strengths as a dynamic language. However, I would gladly pay the cost of more cumbersome syntax to recover static analyzability through a tool like Flow or TypeScript. With Observables in particular, the ability to track the type of the value inside the Observable is really convenient.