Taking students away from poor presentation design has very little to do with design.
Students need to know their content, their message, their purpose. Slides should demonstrate the speaker's central understanding and reinforce a message. Emphasis here on a message. One slide, one message.
Make the message stick with a story. Sit us down, pique our interest, and tell a story. Here's where having stories told to them over the years will pay off. In my book, cultural literacy and storytelling run hand-in-hand with the luxury of grandparents.
If storytelling drives quality presentations / presenters, then you can't put a manufacturer's suggested retail price for having a network of venerated story tellers in your life.