I think you'd have to forbid multiclassing in order to prevent the near-universal result of characters selecting a different class at second level, one more suited to their actual abilities. (Of course, given that the original proposal suggested the players were new and had no rulebooks, multiclassing would be effectively nonexistant due to player ignorance of the possibility … though even were you to find players that ignorant of the concept, I'd still think a clever one would ask if it was possible for his character to try his hand at something else.)