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I work in advertising, and work on motor brands, they amount of purchase decisions driven by advertising in this sector is tiny, so I don't think it would make a difference at all.
One thing that could be done would be take them back to being more basic vehicles, take away a lot of bells and whistles and they would be less appealing to families, but no idea how that could be made to happen.
Or just stop the advertising/promotion of them as anything other than agricultural machinery?