What would have been gutsy is if the filmmakers said that the emotion chip never worked -- it was just an electronic placebo. That Data had the necessary "hardware" to experience emotions all along -- Up until that point he just never believed that he could have emotions.
Yes, I know that episodes like Descent kinda screw this up. But I really dislike the concept that Data was somehow incomplete. Kinda goes against the IDIC thing a little bit. Because Data does not seem to experience emotions the way humans do means he is somehow incomplete?