It seems to me that the growing acceptance of multiple grammatical forms (like Lois'/Lois's, or the fact that the formerly unacceptable use of "hopefully" is now in dictionaries, and a number of other rules that have become less rigid in the past 10-20 years) is likely a consequence of globalization.
It does mean that grammar books printed over 15 years ago, while not necessarily incorrect, are perhaps often more inflexible than more recent editions.
IMO, as long as a writer is clear and
consistent, and knows when to use "formal" language (students who used to give me research papers full of slang were shot at dawn!
), it's all good.
