The Pope's address to Congress: Who's next?

I can't say that I firmly believe this (at least not yet, anyway). However, the thought popped into my head a few times over the weekend so I chose to see what the rest of you think.

Given the current state of affairs in the world, in particular to the the Middle-East and Muslims in general, is it completely insane to think that the reason the Pope was welcomed to speak to the joint session is a precursor to have an Islamic religious leader come next?