I've talked to him about MMM several times before and he happened to be sitting next to me when I took a look at the pictures of the MMM's house and he really liked it. He'll sometimes ask me, "So how's that Canadian frugal guy who lives in Colorado doing?" And now he's interested in MMM's family, particularly his son.
He got kind of panicked that I might ask him to give up his xbox and xbox live in the spirit of mustachianism. I pointed out Little MMM's toy room and said, "See. He has toys and even a cool bike too. He doesn't go without. It's just not insane, knee deep clutter of toys like you used to have when you were his age."
He has organizational issues and I've been forcing minimalism on him. At first he resisted, but now he likes it. In his room he has a bed, bedside table, tv, xbox, clothes in his closet, and one big rubbermaid container filled with games and movies he likes. Once there is too much stuff in the container, he needs to sell or give something away. He likes that he can find his favourite things. In some ways, I guess it's like his own 100 Thing Challenge.
So, I think he understands better now that consumerism is about choices and that more is not necessarily better. I hope so anyway.