Among many linguists the whole study of the Pirahã language is sort of bogus because it goes against a few core ideas of Chomsky that they love so much, almost like a dogma. I've never heard a linguist describing Everett's work as anything other than "cute, but wrong". Personally, I think that's all sad scientifically speaking.
You must hear from relatively a lot of generativist linguists and syntacticians. The linguists at Language Log and elsewhere regularly praise Everett's scholarship in descriptive linguistics. And there is literally no important dispute left, except non-Pirahã specialists claiming Pirahã has subordinate clauses. Getting Everett banned from working with the Pirahã is just sad and pathetic.
