For me, how well a catcher knows and handles the pitching staff is more important than how well he can swing a bat, especially for a backup catcher. I have absolutely zero issues with Wong as our backup catcher. He can be pinch hit for in a key situation late in the game, if necessary.
I always feel that if the rest of the lineup is hitting up to expectations, then we should have no problem carrying a light hitting catcher in the #8 or #9 hole. Of course, if several of our other hitters are struggling at the same time, it compounds the problem. So, the rest of the lineup will just have to hit. :)