I'm surprised more people aren't upset at the whole Bruce gives up being Batman ending. Isn't that something he would NEVER do in the comics?
Upset? No. Disappointed? Yes. But the groundwork for it had already been laid so in context of this story and Nolan's take on the character it wasn't a huge surprise.
Bruce and Selena only had to be aware of Alfred's arrival and to learn when he was headed for that cafe. Then they need only get there ahead of him.