I don't see how the sales figures could be of any surprise to anyone within FIAT. Giulietta is doing pretty much as well as you'd expect a three-year-old car to do in a difficult market. If they wanted numbers, they know how to get them, and have a lot of cash on hand to make it happen, but paying people to take your products is no way to run a company, especially if you're trying to battle a reputation for poor residuals.
Alfa's 166 replacement is necessary to make the Maserati Ghibli project pay off. Alfa's Spider is necessary to make the next Mazda MX5 happen (breaking that contract would be expensive). Alfa's Giulia is necessary to increase group margins in the US market (neither Dodge nor Chrysler can command the price premium that Alfa would).
The only thing FIAT needs cash for is to acquire the remainder of Chrysler. Without Alfa's ability to command higher prices and make this pay off, there's not much point in acquiring Chrysler. FIAT is not short of money. Apparent inactivity on the Alfa front isn't because they're broke. It's due to them needing to hit the US market and get it right first time: A European market that is contracting cannot support what is effectively a new brand launch.
Selling the brand would need to pull in more money than anyone has to spend. Despite being bandied about as possible buyer, Volkswagen cannot afford to purchase Alfa. It simply does not have the cash on hand, and the way it's accumulating debt, it won't be in a position to do so for a long time. BMW doesn't need Alfa. The Japanese don't need Alfa, and only Toyota could afford it. The French can't afford it. Ford, maybe, but their experience with Jaguar and Aston should have frightened them off such notions. Hyundai/Kia, maybe, but there's a real logistical problem, and it runs the risk of having MG's fate: everyone knows it's just a badge.
I don't know anything that hasn't been disclosed publicly, but I'm quietly confident...