No manufacturer in their right mind wants all of FCA. The ONLY part of any value is Jeep and Ram.
My guess is Marchionne has offers for those brands but not for the rest.
Dodge and Chrysler were cash raped and are being left for dead.
Marchionne started off rebuilding Maserati and then got bored and decided to rebuild Alfa Romeo. Now both brands are aimed at the same market and both will require tens of billions to rebuild if all goes well.
Then there is Fiat that has no up-to-date platforms nor class leading models.