I think he did the wise thing by resigning. He knew what his limitations were, what his Doctors told him, and chances are great that He felt as though he would be "cheating" people by not giving it 100%. I respect him for doing so.
It's big news to me. I find new and old as really cool. Monotonous and unexpected things I find equally enthralling. I'm glad to hear something new is happening but I'm also happy to hear there will be a new pope.
He is old, and apparently doesn't feel physically nor mentally capable of the job. But who knows? There may be other reasons considering the scandals in the church. Only time will tell. Interesting nevertheless.
It's his concession to the all seeing eye. Mordor is at his gates and he doesn't think cross hairs look good on him. Jk, I dunno it's k. He looks like a reptile, I'd retire too. He probably looks at his assistant every day and is like "the PILL doesn't even work any more! Why won't I die already? If god keeps this up I'm going atheist!"