I can't say that I hate pop-up flash. I have it and on occasion I use it, but I'm certainly no big fan of it. Putting a pop-up flash on a pro body would make me look for alternatives. It's hard to imagine such a flash, with a GN high enough, and without putting a severe penalty on the numbers of shots the battery would last. The current ways of positioning pop-up flash also leaves a little more to be desired - it's awfully close to the optical axle, and can't be swirled or tilted.
I'd rather save up to an old style hammerhead flash from Metz, than go with a built-in flash on pro bodies.
You hit the nail on the head here!
The flash cant be bounced or directed any other way than straight ahead. That is why I started this thread. What would make a popup-flash good enough to earn aplace on a pro body. I got the idea from my wifes little Sony NEX-6. There the flash can be bounced from the celing. Brilliant!!