Bruce should be happy, but instead, he’s troubled by the fact no one remembers him as Batman.
In fact, there’s another Batman running around Gotham, and he’s doing a phenomenal job.
With that handled, Bruce got to return to live his much more depressing life.
Bruce ultimately realizes this isn’t his actual life and confronts the real Batman in a fight that leads to him waking up back in the warehouse, a victim of the Mad Hatter, who organized the dream.