Do we all really think Gup is gone as far as the World Cup XI is concerned? I'm not so sure.
Yes, on form, without a squad named, he'd be out - no question. But at the minute, the only viable player to replace him - without a bona fide or made-up injury - is Latham. And honestly, if I was to pick an opener for the team to save my life tomorrow, I'd go Gup over Latham. At least Gup has a strong body of work behind him, including Eden Park.
Your only other options are moving Kane or Ronchi up, and both are performing their roles far too well to mess with the balance of our side.
I don't know what you do with him technically, mentally whatever...but I guess you hope like buggery he keeps loving Eden Park, scores runs v Australia (as unlikely as it seems) and finds some belief.