I'm glad to hear of your son's success. I am teaching my 8 and 9 year old daughters Latin this year. When I tell anyone this, they laugh at me and think I'm weird. They ask why I bother teaching my kids a 'dead' language that they will not be able to actually converse with anyone in. I tried to explain some of the points in this article, but again, all I get is the glassy-eyed you're so not cool look.
I tried to take Latin in 8th grade. Transfered to a school that didn't offer it. I tried again in high school. They made the Latin teacher a full-time counselor. Took French instead. I played around with it from time to time. I wasn't Catholic yet, but I was already a hard core amateur historian and wanted it so I could read all those footnotes in the older history books in Latin...
Finally, in college, after taking four semesters of French I took latin for two semesters. It was great. Even though all my teacher wanted to do was gossip about literature and word etymologies, I still gained much. So much is there in the great classic writings (especially poetry) that you just can't get in translation. My latin's not all that great, and I have to use a dictionary a lot, but it's enough to let me understand that Aquinas' poetry is magnificent with subtle nuance and crystalline thought simulatenously...
Nothing like reading stuff in the original!
On the contrary, they may just run into other home schooled folks and become an ultra cool well educated sub-culture. Much cooler than a secret handshake.