One thing you CAN say for Krashen is that he certainly provided ample fodder for research and debate, whether or not his theories all hold up in the end.
Of his five main hypotheses, I can say at this point that I stand by all of them to a point, but with adaptations and reservations:
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Natural Order: Has anyone ever
really proven this? On the other hand, there must be a reason that my students, even after many years of study and harassment,
still don't remember to put the -s on the end of their 3rd-person singular verbs!
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Acquisition/Learning: In fact, I do agree with this distinction; what I
don't agree with is that they are mutually exclusive. I think that adults, in particular, use both "aquisition" (by whatever name you wish) and "learning" to process and ultimately acquire new language, whether L1 or L2, L3, etc.
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Monitor: Krashen makes this sound like a bad thing, but this awareness is how both adults
and children perfect their ability to use languages. L2 learners (especially adults) just use it more!
- Input: Swain had the critique of this one right.
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Affective Filter: I have lots of personal and personally acquired anedotal evidence to support this one!
;-) There's my 2 cents, for what it's worth nowadays!