I agree that would be disastrously stupid if Trump does it. Got to think it's unlikely though. Even with his bad personnel choices, Trump has to realize (especially after the fallout with Pence) that if he picks Haley as his VP he'll be lucky to be in office a month if he wins. All the D's will automatically vote to impeach him on anything and everything, and swaying enough R's to vote to convict will be a lot easier if there's a Neocon warmonger in the VP slot.

Heck, Don Jr said as much a few weeks ago, including saying "I wouldn't have her and I would go to great lengths to make sure that that doesn't happen". Sure, people can change their mind and/or Trump could just ignore that advice, but I think (or at least hope) Haley is a longshot at best for VP.