That was my feeling as well. I was hoping we were gonna get a delightful Monster's Inc ending, but then we turn around and see Batman and Catwomen chilling, and I actually felt kinda disappointed. Honestly, the most surprising part to me is that it's from the same guy who gave us the Inception ending.

Not only does Nolan show Bruce on that reverse angle, but it's a Bruce that looks pretty damn spry for having been literally tethered to a nuclear bomb at the moment it detonated. My personal retcon is that it's the ghost of Master Wayne come back to haunt Alfred. There's your sequel, Zach Snyder.

Well, yes -  the film implies he was piloting, then at the end reveals that clearly he wasn't, because he's alive.  Then you're supposed to remember, oh, right, autopilot.

I'm still a huge defender of this film, and that final shot was the right call in my opinion. It's a nice send-off, it's cool knowing that Bruce has moved beyond it all, and gets to chill with Catwoman in Europe. Still to my knowledge the only comic-book series that has built a decent arc over 3 movies and had the balls to give it's character closure and a conclusion. An ambiguous ending would've been closer to a Marvel post-credits ending hinting that the character could come back in sequels. That final shot for me cements that he's "out" for good and gives the trilogy the closure it needs. It may not be as "edgy", but it's the right choice.