Assad has his gonads in a vise. Syria admitted the IAF blew up something, and escaped unscathed. If he retaliates, he hand Israel the opportunity to do much more serious damage.
If he doesn't, he looks like a wimp to democracy reformers, fundamentalists, his military, his neighbors, anyone anti- Assad. How long can he hang on to power?
Here's the first rational explanation I've seen for why Israel seems so reluctant to act when provoked (like the last Qassam.) The status quo is not good, but it is better than the alternatives if the status quo is disturbed.
That Israel acted points out just how dangerous they considered the Syrian whatever-it-was facility.
Interesting times indeed.