Flip out screen would be amazing! Non-movable screen people often dis flip screen as "less pro" so it has a bad stigma, it's not seen as "cool" to like it--it's a consumer feature. Live view was the same way. The two tie together.
But, what you really need to think of it as, is that live view with movable screen is like having a view camera with a loupe. Only in this case you can move the loupe to any angle you want. Think of the use for landscapes and such. It's a movable loupe.
It's one of the most useful features imaginable, once you've gotten used to it it's hard to do without. It can also be a durability advantage, not a disadvantage!
Plus, opponents of movable screens already have great options: 5d3, 5d2, 1ds/2/3, 1dx, D3/D3s/D700/D800/D600 (soon), A850/A900, Kodak SLRn/SLRc, Leica M9...you get the picture. People who want the movable screen and full frame are stuck with...the upcoming A99. And...that's it.