JazzO says: but if you go lax on the basic core rules of our language then i[n] a few generations people will be saying "me is good"
Two points: The basic core rules of our language have been almost completley overturned in the last thousand years. The language was one, like Latin, in which relationships between words were indicated primarily by inflectional endings on the words. Adjectives agreed with their nouns in case, number and gender and it was through inflectional endings that these agreements were expressed. We have almost completely lost this feature of the language for nouns and have lost it completely for adjectives. The reputed exception of blond/blonde is sometimes mentioned as an example of the continued use of the gender rule but I doubt if you could honestly document this. If you were to examine the common usage you would probably find that the two spellings are randomly used with no regard to the gender (or even sex) of the noun (or referent of the noun) being modified.
Pronouns are fast falling. The form you was the dative/accusative form; ye was the nominative. When we say you are good (singular, i.e., thou art good) we are, for all practical purposes, saying me is good. I have even heard an elementary school teacher saying, between you and I. It is my belief that we are in an unstable period in which we are dropping all pretense of using case differences in any part of the language.
