Um, hello? Anyone ever heard of a little technology in Java called applets?! As far as I can tell, we've had the moral equivalent of Ajax available to us since the last century, and yet applets are now regarded with the same esteem as a sleepover at Neverland Ranch.
Where did we go wrong? The one key difference I can think of is that applets had the unfortunate requirement of needing to be loaded all at once. It's the "asynchronous"-ness of Ajax that's permitted it to evolve into the high-flying eagle of the Internet, while applets have sunk into the AWTar pit with the other dinosaurs.
Grumble. To quote the immortal Garth Algar: "We fear change."
To be continued...