Depends on your definition of "realistic", but if I am Danny, I keep Sacramento on speed dial about Evans. If they are not going to resign him this summer, when he is a RFA, they may be interested in getting something for him now (think Memphis with Mayo last year), and may consider something like Lee and the C's first rounder.
I think Evans needs a change of scenery, and he could be a special player on a team like Boston, who will really appreciate his ability to take the ball to the hoop, and his overall toughness.
I was less thrilled with him playing next to Rondo, but with Rondo out, its a great chance to take a look at him for a couple months, and maybe hope he can regain some of his ROY form to help this team make a little noise in the playoffs.