There will come a day when high ISO values will mean little to the overall value of the camera. High ISO settings are still making a ripple because digital photography is relatively new, and film was the standard for IQ for over a century. Yeah, it's cool and it's very helpful under certain circumstances, but good IQ from high ISO settings are quickly becoming the norm (thankfully).
Eventually, users will manipulate their ISO settings just like we manipulate our aperture and shutter speeds. It will become the third adjustable variable in pro cameras, if it hasn't already.
For what purpose? ISO has no effect upon composition in the same manner that aperture does and shutter speed might, the latter depending on what is being photographed.