With a fully healthy Rondo, I think this team has a ceiling of 38 wins. That's the absolute peak this team can achieve and even that is a major stretch.
Without him... there's no limit to how terrible we can be. I kinda expect we'll ask Rondo to pull a 2007 Paul Pierce and sit the majority of this season out. Maybe a Jan/Feb return, he'll play a handful of games... he'll have unforeseen "setbacks"... I'd be surprised to see him play more than 30 games this year. But just in case he throws a wrench on our tank party, I drafted him on my fantasy bball team. I've got all the bases covered this year.