Here we have another case surfacing of "mainstream science" theories in
the humanities being rebutted because they do not fit the actual
evidence. See the Scientific American in
Evidence Rebuts Chomsky's Theory of Language Learning.
Chomsky is one of most quoted mainstream scientists in our era, but his
theories about language learning are simply wrong. Language is WORDS,
while grammar is a nice touch, but it has little to do with the way
language is naturally learned.