64 bit processors are inevitable Apple or not. A 32-bit CPU can only address 3.5GB of memory. With the Galaxy Note 3 and other top of the line phones running 3GB they're forced to make the move sooner rather than later.
Let's be honest and point out that Apple went 64-bit for mostly marketing purposes. And it that sense they may have a point in that Apples competitors will want 64-bit to take that marketing advantage away.
But let's not not pretend that releasing a 64-bit Arm chip is somehow innovative.