CAgirl,
Let me tell you what happened to my son. He started out as a pitcher, pitched regularly through Freshman HS. Was a very good pitcher. Dad thought catching would get him farther, he had catcher's build and an accurate cannon for arm. However the further he went (college), the more apparent his hitting wasn't good enough. He went back to pitching senior year of college, did very well. He was briefly scouted, but his number never came. From his last college game, he played only once, an alumni game. He hasn't spoken a word since or picked up a baseball.
The moral of this story is, teams cannot afford a light hitting catcher no matter what the defense wins games crowd claims (see Mike Zunino). So, your son has a good arm, pitches well, but struggles at the plate, concentrate on pitching. Good luck.