We do intend to change it. You can see out plans (in a somewhat undigested form) at http://etherpad.wikimedia.org/p/design-multimedia-uploader

But usage metrics from the current interface can still be helpful for designing a different one.

That's the million dollar question... given that small improvements will have instant effect (but is wasted time in the long run), while a big redesign will take several months (I am being optimistic here...), we will have to do some mix of the two, but exactly what mix that will be is an open question.