Wind-up or not, with the availability of the new breed of GPS with terrain mapping / awareness and 3 Dimensional terrain rendering will make this kind of approach the norm for many operators as it has already started to become. I know of operators conducting the Garmin 396 approach into a host of locations that don't even have published approach procedures and even the ones that do. With a new GPS and blue Mountains type EFIS or similar, you could fly up a valley in blanket fog with Top-Gun precision following the 3D terrain. When you've experienced a GPS like this, it's so hard to not use it, rely on it and trust it. It's where it's all headed, although I'm still yet to work out what happens when you have a GPS failure. Pull up very quickly perhaps ?
