I totally agree with +Vance McAlister
I want to have my Google+ albums as folders in Drive as well. For my sanity it would be good if all content I have in my Google account was kept in Drive.
Calendar files kept in Drive but accessed in Google Calendar (obviously)
Sent and received mail attachments (or even all my mails) in Drive and the corresponding mail linked to it so the mail can be accessed by Gmail.
Each and every picture
Each and every file
My Gtasks, shopping shortlists and Play store wishlists, my Google and Chrome Bookmarks all being merged with Google Keep - all shown in Drive.
All my ebooks, movies, music and audio files, be it from Play or elsewhere (maybe with some mechanic to deny Pirate Bay like sharing).
I want Drive to handle the storing (of everything) but not the sharing of things. That's when I want to have G+ taking over.