Never, really.
I gave up chasing ultimate convergence years ago. More hyperbole.
A dedicated device will always be better at what it is dedicated to do. Similar to how a tablet cant really replace a laptop for me or mobile games cant really replace even handheld gaming devices.
Phones can be the jack of all trades but masters of none.
I was considering getting a Samsung Galaxy Camera or S4 Zoom just for the 23x and 10x optical zooms and Xenon flash. They wont replace phones, per se, but at least it opens up a slew of options for dedicated. cameras.
I figure, put Android onto OTHER gadgets that isnt only a smartphone and tablet. I hope Canon, Nikon, and Panasonic considering putting Android onto their future cameras.