I do not think the presentation of the small model of the FC-31 to the Pakistan Air Force Chief means at all that Pakistan will be getting J-31s.WAHOOOO!!!!!
therefore IMO J31 will be very much on in small numbers maybe 40 (2sqd).
But time will tell......
IMHO, unless the J-31 turns into a PLAAF or PLAN aircraft, I do not think Pakistan will.
But..as we say...time will indeed tell.