Besides what the sibling comment said my brainstorming is: - Culture - Cost (sedans are cheaper), but income has gone up, especially in suburbs. - More people l

Besides what the sibling comment said my brainstorming is: - Culture - Cost (sedans are cheaper), but income has gone up, especially in suburbs. - More people living in urban areas with more money, but our urban areas still need cars. People who would buy a truck if they were rural, buy a SUV when suburban. - Smaller family sizes so minivan isn't needed. - Gas prices have plummeted so worse MPG doesn't matter as much compared to sedans.