That's the one unit in this company family that IS making money. Although I would agree that selling off the Cubs would be the best thing to happen to the Cubs, it doesn't make any sense for them to sell off the one unit that's actually making money for them.
The Tribune Company may have to sell the Cubs because I've read Tribune has a huge tax bill due. Selling the Cubs for maybe US$700 million would not only help pay for that huge tax bill, but also maybe put some money into reviving the Tribune Company newspapers.