Daimler bought Chrysler during a high cycle and paid a bit more than some thought was wise. Since that time, reported losses, management shake-ups and the bad press that accompanies have certainly devalued the company (check the ticker).
Were Daimler to spin-off Chrysler at this point, they'd be grabbing the ankles in large way.
Additionally, Chrysler may actually be a tough sell right now because likely suitors may wait for recession (consumer confidence not currently at an all-time high) in anticipation of a full-on fire sale.
Meanwhile, Daimler might do well to bring Lutz and Gale back into the fold. Maintain and build upon what has become the Chrysler brand, which I think is a full range of uniquely styled cars and trucks. Maybe toss in a little Daimler engineering expertise and they'd have perhaps an even more attractive company to sell than the one they purchased.