I couldn't care less if either of them goes into bankrupcy, they make cars that no one can afford to drive
GM is not going to build F-150s, and Ford isn't going to build Silverados. There could be more joint development of pieces not so visible to the customer, like transmissions ( https://en.wikipedia.org/wiki/New_Venture_Gear ). Maybe a joint small electric car, to get volumes up and costs down.
The GM/Ford merger has been going on for close to 60 years. It started with small block Chevys being dropped into Model A's and continues with LS into Fox Stang swaps. LOL.