You know, that's really true -- they won't let him go that easily. Not now that he's like the most popular guy in Europe or whatever. :)

(LET IT BE SO.)

I'm also more or less of the opinion that as long as the Rose story has been wrapped up, there isn't much you CAN do to mess up Ten's arc, because if he's had resolution with her, he'll pretty much be a blank slate. Rose was Nine's life. Then Rose was Ten's life. Take off the rose-colored glasses (I am so sorry, I had to), and you have an entirely new Ten. I say let Moffat play, so long as Tennant gets to make it his own.