I think it lost when it introduced the weird (but also appreciated by many) dual non-touch screens.
In my view, this was the main thing. I don't agree with this reason, but I am pretty sure it was it.
I think its the future, 2 touchscreens, left for acomp, right for mainsounds and 8+1 slider and 8 encoders(knobs) in the middle..
Just look at the E-A7