I am the same way, unfortunately. And I say that because I am the type that is decent at anything I do, but great at nothing. I get very bored, very easily. I envy people that are great at whatever their craft is.
Saying that, however, DS6 is the same way, and I encourage it, even though I have issues personally. At this age, I want him to experience as much as possible. The one thing that "messed me up" was quitting before I got through to the "end", which is where I don't let DS6 go. He has to get to the "end" before deciding he doesn't want/like to do something.
So basically, I wouldn't discourage it at all, unless you start to see signs of "giving up" on that new path when something gets "difficult" (sign of perfectionism). I would call it very normal at 8.
