Think about it.
FCA has wayyyyy more market share in North America, plus Ram / Jeep to hold down the market for trucks / SUVs / crossovers. VW sells a bazillion Golfs in Europe and everywhere else, in addition to having Lambo and Porsche on board to fill in at the high end. Don’t forget Audi for the luxury segment.
The two companies would fill the main product gaps that each other has. The cost savings from parts / platform sharing would be pretty sizable as well.
What could possibly go wrong?