If it's Little League, he has to get his minimum play. But beyond that, there are no guarantees. Although re-reading your note, if you child is only 8, and pitching, it probably isn't Little League. Most little leagues use coaches or pitching machines at that age.
Wouldn't that be nice, but no, here in farm, it's kid pitch, usually the coaches' sons, and it can be PAINFUL. Having two boys, 5 years apart, you forget how horrible it is, until you're back watching enough boys walked in one inning, until they score 5, and then they put the other team on the field.
OP, lower your expectations. My oldest was always either catcher or first base, and in LL played most, if not all innings, but there were a few travel games where he only played 3 (ended up on a travel team with 3 catchers).