On Newsnight just now a Conservative politician told Kirsty Wark that judging the possibility of criminal acts by Andy Coulson was
"not for you or I"
Now this could be explained as a simple extension of the creeping increase of "for you and I". And one of the usual explanations of this is that
you and I is a 'conjoined' unit, of which only the first pronoun takes the objective case form — for example for him and or for them and I. You can hardly call the phrase you or I 'conjoined', but it is, arguable, a unit.
However, this can't explain the politician's grammatical choice. Earlier, He's told Kirsty that judgement of Ady Coulson's activities was
"not for you or for I".
This could well be a signal of the future of English grammar. Accusative and dative case forms long ago disappeared from nouns — leaving a small rump of 'objective case' forms for