Anyone can be traded. Kareem was traded, Shaq was traded. The question is what value are you getting in return? If you think it improves the team, sure you can trade Rondo. At this point, coming off injury, you're probably going to get junk offers.
So hold onto him, let him rehab next year. We will be horrific next season so they will need him to sell some tickets with his "imminent return".
I personally don't we will see any big moves until we see how the lottery and free agency and trades go in the summer of 2014. If we totally strike out, it may be trade Rondo time, but in the interim, it's best to just sit back, develop the youngsters, and hit the lottery..