No, Mecca isn't a threat. However, if these people wish to carry out a "holy war", then they must understand that there will be casualties of a holy nature. Hence, Mecca disappears.
The destruction of Mecca may force the average law-abiding muslim into action to overthrow their governments that sponsor terrorism. Or it may turn all of them against us. Either way, nothing will be the same again if we are forced to vaporize their holy city.
Whatever happens, they must be forced to understand that we will stop at nothing to achieve victory. So far, we have restrained ourselves to an incredible degree. That will change with the loss of a city.
Remember: we lost 2500 people - only 48 of whom were civilians - at Pearl Harbor. As a result, we fought Japan for 3 1/2 years and vaporized two of their cities. On 9/11, we lost 3000 - almost all civilians, including women and children - and as yet have not taught the Muslim world the lesson we taught Japan. Personally, I don't think I would have had the courage Bush had to not launch a nuclear strike.
I wasn't aware that you were in the policy making business. This wasting Mecca stuff is nothing but a bunch of arm chair wanna beez spouting off jibberish. The only thing that would accomplish is to widen the war and increase Arab tension throughout the world. It's not going to happen so give up your childish revenge thoughts and get real.