Being correct

I learned from the Columbia University linguist, John McWhorten, that a modern language like English is always changing.  I have also read that some linguists in the past, and maybe others, thought that Latin or Greek or Hebrew was somehow superior and that English would be better in some way if some rules or practices borrowed from such languages would improve or "raise" English.  

My wife is careful to answer the phone inquiry "May I speak to Lynn ?" with the statement "This is she."  Except for her, I don't hear such statements.  I hear "That's me" or "This is Lynn."  The other day I headed a blog post "It was me" and one or two people offered the correction "It was I." I like the wording I used but maybe I am just low class.