I have long thought so for several reasons mainly in the fact he was such a media hog up until we invaded Afghanistan and he has been silent since. All his missives since 2001 are not conclusively from him and no reputable sources even Al Jazeera have seen him alive. There is a great article in the American Spectator that looks into this in great detail and comes to many of the same conclusions I have. It even examines if his Al Qaeda network is even really relevant anymore and if the main terrorist organizations are really state sponsored or just tolerated. It is a must read on how our own CIA is seriously out of whack. I have read Lawerence Wright's "The Looming Tower" so this sounds very credible to me.
All the evidence suggests Elvis Presley is more alive today than Osama bin Laden. But tell that to the CIA and all the other misconceptualizers of the War on Terror.
Seven years after Osama bin Laden's last verifiable appearance among the living, there is more evidence for Elvis's presence among us than for his. Hence there is reason to ask whether the paradigm of Osama bin Laden as terrorism's deus ex machina and of al Qaeda as the prototype of terrorism may be an artifact of our Best and Brightest's imagination, and whether investment in this paradigm has kept our national security establishment from thinking seriously about our troubles' sources. So let us take a fresh look at the fundamentals.