Yes.
If the Celtics fail to make the playoffs, potential future Celtics might start to think "Rondo wasn't good enough to lead his team to the playoffs with Ray, Pierce and KG, maybe he isn't good enough to help me win a title?"
Yes, I know. That is a big jump in logic, but with all the other issues that hurt Boston as a place players want to play (mostly because they want the warm night life), this just creates one more issue to worry about.