I dont think there is a shortage of Instructing Jobs...Just got to know where to look.... And to move (Goes without saying though!)
For entry level Gr3's there is the Local Aero Club/Flying School...so on and so forth....
And not too mention over in the West... China Southern/Singapore Flying Colleges are always looking! Whether it be for a flight or a ground school position.
And I am sure for the more experienced/qualified Instructors there would be positions out there.... Now thats were i think we have or are starting to see a shortage!!!
Be prepared to Go out/Meet n Greet/Phone/Write/Email to keep your name heard.... Another handy tip "Know Someone!"
Hope this has been a lil beneficial!
Cheers
SilverLined