The banding noise issues are the result of high frequency components, particularly when they are off-die. Sony Exmors design was implemented in the way it was implemented to achieve more than just high dynamic range at low ISO. Fundamentally, Exmor's Column-Parallel ADC is designed to support high speed digital readout. Certainly, increasing frame rate from 4fps to 10fps will increase noise contribution a little (that's the consequence of high frequency logic), but Exmor has such a low read noise level that you could effectively double it, and still have one of the cleanest readouts in the world.
It is not improbable that we could see high res, high readout rate sensors at 8-10fps within the next couple of generations of DSLR sensors. I don't suspect it will happen by next year, but I do expect it to happen.
Hopefully it happens with a 5DIV (frequently shooting a 5DIII) or 5DV. Wrong camp, I know, but I guess new tech will be applied in other bodies too. As I am all for highest possible ISOs...