Given that the PM would have faced a tornado of criticism for triggering Article 50 without the referendum, sending the EU the equivalent of a constitutional "Dear John" letter, the decision that Parliament must be consulted prior to Article 50 being triggered seems the only logical conclusion.
The referendum was not binding so I am expecting the Supreme Court to reach the same conclusion when the inevitable appeal reaches them.
But this does present our elected representatives with a dilemma. Do they vote with their conscience (which would most likely result in Brexit being voted down), with their party whip (if the parties feel that they can whip a constitutional vote) or with their constituency (who in most cases are likely to deselect them if they ignore the referendum result)?
I don't normally feel sorry for MP's but a smidgen of empathy is creeping in for our elected oligarchy.