Chomsky's Theory of Language Development discusses "critical

Chomsky’s Theory of Language Development discusses “critical periods” for learning language. Following from this theory, disruptions during critical periods should negatively affect the development of language. 

Unfortunately, there are some examples from real life to demonstrate this hypothesis. Please link to and read the following regarding both a recent and an historic case:

 http://abcnews.go.com/Health/story?id=4758945&page=1

Obviously, these are two horrific cases of child abuse. What does “Genie’s” final outcome tell us about language (and emotional) development? What cues can educators take from these tragic cases?