I highly doubt that they will kill off Batman, but Im sure since its Morrison we are in for a big shock.
I agree, Morrison is certainly from a very post-modern/Deconstructionist school of comic-book writing. While I think Batman works best while actively downplaying the more fantasy/sci-fi aspects of the medium (I guess I'm quite the Nolanite) I think Grants off the wall approach of toying with the medium, starting way back with Doom Patrol and Animal Man, certainly has its place, even for Batman. While I can't say his run so far has been far from the high art both Batman stories and Grant's writing are capable of, he does kind of have me at the edge of my seat, waiting to see what's gonna happen next, and that's freshness you rarely gets with any medium.
Up to this point I can certainly see how anyone might call Grant's run haphazard and undirected, but I think he's been deliberately setting up a lot of things to build toward this point, and I think it will pay off. Frankly, I never trust the guy, I don't think Batman R.I.P. really means what he wants you to think it does, but if they do kill off Bruce or retire him, I think there will be a lot more to it than just a publicity scheme like the death of superman or any of the myriad deaths that have happened since, and if that is the case, the character is some 70 years old, he's not going away that easy.
I think with the Batmen (a very cool a spooky concept) and all this craziness with Batmite and batman revisiting his past, and Ras and the Joker at large and Damien being around, you have a lot of very weird wild cards to play and I think he'll play them well. It's definitely a roller coaster ride, and if it turns out crappy, give it time and it will fade out of continuity and into obscurity.