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I've been riding discs on MTB for 10years + now. And in the UK, I've never experienced overheating to the extent of noticeable reduction in brake performance (came close on a 4mile+ descent that gets steeper and steeper towards end with a 50l / 15kg backpack on).

Has anyone using a modern open system disc brake ever experienced overheating? I've not heard of it ever happening. One mtb race which certainly puts the brakes to a test is the Megavalanche. It drops 2000m in 30km, not all the race is down though but there are sections where you're on the brakes not far from constant for several minutes.

I think as well as the lower end of the fork need needing strengthening to put up with the torque it will need something for it to put up with the heat. Apart from that I see no real problem.