I too am happy with the tumbler. i must admit that i was a little freaked/scared when i first saw it but after watching the film and coming to terms with the new batmobile i liked it. it worked for the film with the whole real world batman idea.
Saying that thou, i think it would be a cool idea if they were to have Tim Burtons batmobile in the next or third film. i know it will never happen but my reason for it is:
By the third flick Bruce is pretty much going to 'be' Batman which in Tim Burtons film he is as well. So it would be cool and a nice in joke if they had Bale burning up the streets in that mamma jammer. it would also tie in with the whole 'beginning' idea as well. he had a tank when he started off, now people are more acustomed to the Batman he has a sleek son-of-a-***** motor.
Of course it would never happen but it makes my fan boy heart beat faster.
People become acustomed to all things when it is there for a long time. Stick with the tumbler with no to minimal modications and people will get used to it. The Batmobile in The Batman looks similar. This is how Batman came to be what he is TODAY. The previous form before Batman was "Just Some Nut" as James Jim Gordan (Brilliantly performed by Gary Oldman) puts it. Now he is Batman and if he changes into anything else besides what he is right now the next film truly deserves the title BATMAN BEGINS AGAIN.