I get that the situation isn't wonderful, but if you read the whole article, it is a lot more reasonable/optimistic than the excerpt posted in the OP from Boston Sports Journal's, Dr. Jessica Flynn.
I am not sure if there is a path for him to get all the way better and play pain free for the rest of his career, but I think this is a 'remains to be seen' situation, not, 'we're totally screwed with an albatross contract' situation. Let's all remember, Kemba was playing very well in the bubble/playoffs up until the whole box-and-1 fiasco. It's up to Brad to coach around that because Kemba is still an exceptionally talented offensive player.