Is It Time to Wave the White Flag for the Objective Case?

There are, of course, many sayings related to wars, including "waving the white flag" and "picking your battles." I've been writing for some time about the demise of the objective case, especially after prepositions. Now I see even English professors writing sentences that include the phrase "for John and I."

Have I chosen the wrong battle? Is it time for me to wave the white flag and accept that the language has changed to the point that it's a waste of time for me to point out that because you wouldn't say "This happened to I," you shouldn't say "This happened to John and I"? Am I fighting a losing battle here? I'm beginning to think I am.

However, on a personal front, I will never surrender. That is to say (between you and me) that I will continue to use the objective case following prepositions, including the preposition "between." The war may be lost, but I will continue to fight.