Marc Lynch at foreignpolicy.com notes the lack of interest shown by the Arab media in the Detroit plane bomb affair. He writes:

The Arab media's indifference to the story speaks to a vitally important trend. Al-Qaeda's attempted acts of terrorism simply no longer carry the kind of persuasive political force with mass Arab or Muslim publics which they may have commanded in the immediate aftermath of 9/11. 

Even as the microscopically small radicalised and mobilised base continues to plot and even to thrive in its isolated pockets, it has largely lost its ability to break out into mainstream public appeal. I doubt this would have been any different even had the plot been successful – more attention and coverage, to be sure, but not sympathy or translation into political support. It is just too far gone to resonate with Arab or Muslim publics at this point.