If your boy had that much fun, it doesn't sound like a problem to me. The 8 weight rigs will work well for fish a lot larger than bluegills, so you have rods that you can use over a pretty wide range. I know that some of the guys use them for saltwater flat fishing also.
The only thing I could add would be that if you continue fishing for the smaller stuff like bluegills and trout you might want to also consider something on the lighter end of the scale, like 3 or 4 weight. The 8 will work for most occasions, but I would look on it like fishing for them with 15 pound test. The 3 or 4 weight would put a lot more challenge into the fight, and allow a bit more delicate presentation if you ever run into some finicky fish. Glad to see you give it a try. It sure is a fun way to catch 'em!