"Aw, man., Every week there's a canal!"
"Or an inlet"
"Or a fjord"
How true.
First, have none of you seen an attractive female before? That said...if The Batmobile does indeed get blown up in some kind of story twist (IIIS BATMAN DEAD??? DID WEEE KILL HIM?), whatever, fine. If it gets blown up just so they can bring the Batboat or Batcycle or Whirly-Bat into play...BOO!
After all, as much as we all like explosions, getting rid of The Batmobile has kinda been done. He lost the Batwing in BATMAN, BATMAN RETURNS featured a pretty cool chase/control sequence that more or less took The Batmobile out of action, BATMAN FOREVER had an entire cave blown up, and BATMAN & ROBIN saw the Batmobile flash frozen. So if they're going this route, they'd better have a good reason to do so. One heck of a story point. Maybe the cops blow it up during a pursuit? Although I think I'd rather see it sink...and then become a Batmarine, as long as they're going to go the Bond route...or, OH! A Batpontoon!
There are boats, submarines, bikes, a plane, various helicopters, whirly-bats and a rocket to draw from. But there are better ways to get to that stuff than just blowing up The Batmobile for the heck of it (which I doubt is what's going to happen, but you never know). We've seen a boat, and we've seen the planes. I'm hoping they bring in the 'copter. I mean, Nolan kinda liked THE DARK KNIGHT RETURNS, right?