In 2008 I was certain he would get it back. Now.. it's really difficult to say. If you trust Federer's presser and don't believe he's in denial, then he can get #1 back, absolutely. Reality-wise, I think it would be very difficult but not completely out of the question. Something like 25-30% chance.
This was how I felt as well.
btw, i made this same thread like a month ago
Will Federer become number 1 again?