It's the first thing that got on my mind as well. The damage is done already.
Two things can happen now. One is Rondo being... Rondo. I mean this would affect anyone. For me, Rondo is as important as Pierce. I only found out we didn't draft Rondo a few months ago (but he was with the team minutes within the draft's end). It's shocking but also it's the American business.
Two, you got Garnett, Pierce and Allen on your side. A guy who defines mental toughness and a beast of a man that most mankind can look up to; You got Pierce (need say more than stabbing, league's MVP, franchise legend?) and Allen who has in my mind always been a teacher kind of guy. After all, we've all seen his motivational speech before the Warriors game.
Personally, I think that Doc, with the help of the 3 HoF-ers, won't let Rondo sink. Rajon's got a lot to prove now, and this should only help him become a lot better player.
P.S. How many of you can see in your heads an ESPN report in 2020 mentioning Rondo as a Boston Celtics legend who never developed a jump shot but makes this team championship caliber?