You can't see it as an operational requirement for the Saudi forces, since the JF 17 doesn't offer anything that the Saudis wouldn't already have in far better capability. If at all it would be a political move, in favour for Pakistan and it's aero industry.
Far more interesting from an operational point of view, should be Turkey's developments for an own stealth fighter. The Saudis know that the western countries won't sell them one anytime soon and Turkey is on a good way to develop the capability in the aero field. Joining them would be possibly the only "independent" alternative to get hands on such a NG fighter.
JF 17 for most Gulf countries would not be an operational choice, since they can afford and have access to better fighters. Which makes an export success in this region highly dependent on Pakistans government.