What makes it "literally impossible"?
The no-trade clause. KG has said many, many times he's green for good.
That doesn't make it literally impossible. In the history of civilization, dozens of people have changed their minds. That doesn't make it literally impossible at all. Actually, by very definition, that makes it possible. Not likely, but possible.
It's so unlikely that I'd consider it impossible just as .99999... = 1
So you mean figuratively impossible, not literally impossible.
Unlikely to happen and impossible are two different things.
For an example, the Bobcats winning the 2006-2007 NBA title is literally impossible. That title has already been awarded. There is literally no chance of them winning it.
The Bobcats winning the 2012-2013 NBA title is figuratively impossible. There is figuratively no chance of them winning it.
So if Doc and Danny were to find a trade that they liked, find a location that KG liked, and begged KG to waive his no-trade clause, he still wouldn't? Why? I think any rational human being would, under the right circumstances.