Probably some engineers to make a new vehicle platform-
Then instead of multiple teams turning the platform into multiple vehicles with multiple trim levels, you'll have a single team that makes one vehicle or a few different classes of vehicle on a platform then the 'AI' does the rest.
To use VW as an example-
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One senior engineering team at VW or Porsche designs the platform (ie. MQB)
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One or few junior engineering team(s) at VW designs vehicles (ie. VW Golf, Jetta, Tiguan)
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A few specialty vehicles get all-human treatment (ie. 911)
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A marketing team at Audi, Skoda, etc will design their generational design language
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The rest is 'AI' generated from the platform, vehicle type and desired design language.
Stripping VW Group of multiple engineering teams, mostly outside Germany.