In reply to suggested duplicate question: It may be that I can find some useful guidance from the earlier Answer (for which thanks), but I'm really asking whether there's a general trend, particularly in the everyday speech of well-educated people, in misuse of "I" for "me", rather than explanations of individual instances.
Nowadays, people often (usually, even) use "I" when my intuition as a native English speaker (physical scientist; by no means a grammarian) tells me they should be using "me" - even not-so-young humanities graduates from top universities are doing this.
If this is indeed ungrammatical, then perhaps people are acquiring a fear of referring to themselves using "me", as if that is somehow betraying a sense of excessive self-regard, even though "I" serves the same function...?
A PhD colleague today wrote: "Having a test available for Julia and I to review would be helpful."
If this is simplified to: "Having a test available for I to review would be helpful." seems quite wrong to me.
Are a great many other people wrong? Or is it "I" who is wrong? (Though I must confess I'm now not so certain about "I" in this latter example.)