I LOVE IT!
Yes, he's struggled, yes he's rusty, yes he's lost his confidence at time, but..
What better way to get a guy to play the most focused, intense basketball of the season, then by having Doc tell him "I have faith in you to run the point of this team in the NBA effing Finals."
Another thought,... I like this just for the transition D. I'd rather have TA on Kobe in transition than Rondo. TA has had success against Kobe in the past, and while there's bound to be some rust, he may absolutely spark that success again.
I say give him a chance, and see what comes out of it. If he turns it over and makes stupid plays, give him a quick hook.