So people can use the phone in the classic way. Or maybe have each gesture feature as an option so you can use whichever features you like and disable the ones you don't.
Yes bb10 is gesture based but maybe some of the programmers here can weigh in on how difficult it is to do something like this.
A while back I suggest a bbos8 or bb11 operating system not something completely brand new but something that takes advantage of gestures and buttons.