Would be awesome as an exercise in ultimate performance capability for this chassis. I'd love to see what they'd allow it to accomplish without the politics of its bigger/more expensive/less inherently sporty "ute" sibling at play.
It'd be fun as an ultimate statistical geek out for the Macan. Stripped down, lighter, edgier, etc. Thus it would raise the status of the nameplate. But it just doesn't sound realistic or sensical from Porsche's perspective, as the "GT(numerical)" cars are legit sports car chassis', currently. Also, I don't think Porsche is concerned with the Macan needing to earn "more" dynamic reputation just yet, as it's already crapped on the "SUV" sector there, with just the launch models. Then again, they'd time it for later.
Still, hope that it would become a reality.