Why JavaFX should be inlineable with HTML raises an interesting question in my mind. He's making a number of suggestions about JavaFX and many boil down to the power of "View Source" and perhaps JavaFX script code should be directly runnable as part of the source of a web page.
That's an interesting suggestion and maybe it would work well. It remains to be seen whether that equation could be implemented from a technical standpoint. However there's a non-technical control point which is in the way.