Quote Originally Posted by Marshal Murat
Why doesn't Honda change their name to 'Ford'
Toyota changes to 'General Motors'
Subaru ' Chrysler'

Problem solved. Sorta.
Why would they abandon recognized and respected brands for something else?

Buying out someone is another matter. IIRC the South Korean Daewoo motors were bought up by their old partner GM. Now they're rebranded as Chevrolets and so on, but then they were often based on obsolete GM cars to begin with.