Morgan Spurlock -- Harry Styles Is Next to Bolt ... In NEW Direction

Harry Styles is about to go the way of Zayn Malik -- bolting from the ranks of One Direction ... at least according to acclaimed director and honorary 1Der Morgan Spurlock.

Spurlock directed the docufilm "One Direction: This Is Us" -- which, outside of Simon Cowell, makes him the foremost expert on the band ... among grown men. Morgan told our photog the band will be fine as a foursome for now, but it's only a matter of time before Harry splits.

But even that won't kill the band. Check out Morgan's prediction for Niall, Louis and Liam.

Think flattops -- on white guys. It just might work ...