Whats really funny is we are debating just what has been all over the news in the past year. Very few airports are ready to handle the A380 with some spending 100s of millions to get ready. A lot of airports will not be able to do that for some time.
As far as the A380 diverting being a rare occurance, just look at how many times 747s and A340s divert in the past year. Eventually it will happen and when it does it will effect every aircraft that is using that airport as an ETOPs alternate.