Actually, they probably have over 20 that are still able to fly. (hard to keep track since they crash them occasionally)
You may be correct...however “Still able to fly”..is NOT the same as combat-ready..
The big question is: how many are able to fly ENOUGH to give their pilots enough flight experience to be competent in combat? "Top Gun"-style aerial-combat exercises stress airframes.
If we had a real president, he could have a swarm of Predators (protected by a flight of F-15's) bomb the crap out of that airbase, then fly away. Never make an announcement, just silence and "no comment". Then let the mullahs wait a few months for the other shoe to drop.