I agree wholeheartedly with this post, and I think the bolded is an important point to remember.
Not unexpectedly, he wore down, both mentally and physically, in his first NHL season. NHL vets had a hard time dealing with the grueling, condensed schedule last year, never mind a wet behind the ears kid, who had already played 32 games in juniors.
Based on the fact that he wore down and ultimately ended up being unseated by Bart and Krug, it's easy to forget how effective he was for the majority of the year. He did finish 3rd on the team for scoring by defenseman (16), behind only Chara (19) and Seids (17). More than that, he consistently made plays that indicated just how high of a ceiling he has. I also think that he did not often make the same mistake twice. It wasn't until later in the year, that we saw mistakes creep into his game more consistently.
Overall, I expect him to log more minutes in bigger situations, and make fewer mistakes. Points wise, I don't know, but I would bet he falls behind only Chara for Bruin's points by a defenseman this year.
I really hope to see him in Boston the full year. I don't have an issue with them keeping all three kids on the roster, and after Chara and Seids (maybe Boychuck) play the rest of the guys based on who's going well, match-ups, and maybe even give Chara a rest here and there (easier said than done, I know). Point is, I think you can find playing time for all 7 guys, if that is what they want to do.