Just heard that SWA cancelled several flights to do intrusive testing. Bravo. Should have done it sooner.
What do you want them to do, ground the entire -700 fleet on a whim?
They’re acting prudently.   
The blade failure does not concern me in and of itself.  That happens.  Can’t be avoided.  What concerns me is how something can hit a passenger window seven rows back.  That’s a certification issue.