It won't. Psy op. It's actually a renewable resource but the jews have convinced the populace otherwise to jack up the price. Stop having such grain fed opinions.
Why hasn't there been any worgen outbreaks since Cata?
Could have some nasty actors stealthily nicking humans with their claws and spreading the curse or some shit. We know they are still contagious as Tess asks her father to make her Worgen.