Is JSON better than XForms? That's an apples and oranges argument. I am willing to predict that XForms + XQuery will become a powerful enterprise model for rich form content, because the enterprise is considerably more XML-centric than the consumer stack is. I'm willing to predict that JSON feeds to most mashups will likely end up being a mix of XML (primarily via feeds) and JSON for quite some time, though I'm inclined to suspect that AtomPub will likely tilt the balance of power towards XML in the long run.