To clarify: I think it'd be better if the Unicode Consortium changed the properties of U+2019 than change which character is the canonical representation of an apostrophe, given you won't be able to change most documents.

If you make apostrophes a different character, how would you make sure apostrophes and end quotes aren't confused? Unless you're a Unicode fanatic, you probably won't manually edit sequences of hexadecimal codepoints.