I can see the market opening up for high altitude, anti-blimp weaponry.
Unfortunately (or maybe fortunately for us), the popular Stinger Missile, FIM-92B, while it has an attack range of at a range of up to 15,700 feet (4,800 m); it can only attack aircraft at altitudes between 600 and 12,500 feet (180 and 3,800 m). So 20K altitude of these blimps is out of range for a hand-launched system.
Wiki says that The FIM-92F developed in 2001 and added to the 1996 Block II improvements improved the missile's effectiveness in "high clutter" environments and increase the engagement range to about 25,000 feet (7,600 m). Production was scheduled for 2004, but Jane's reports that this may be on hold. So the new gas bags aren't totally out of the woods; just very effective against impoverished militaries.
