I'll certainly put my name down as one who didn't initially like the vari-angle display. When I bought my 7D, it was that, or 50D, or 550D, they weren't on the market then, but I'd still buy the 7D again even with added choices of 600D and 60D.
But there's times I wish I had one, taking photos of baby birds in a nest yesterday, with an MF lens on an extension tube and live view, I could barely reach my hand high enough and could only just see the screen. Taking very (very) low-angle shots to try out the new tripod too, it was hovering 1cm above the floor pointing straight up, I just had to guess roughly where I was pointing (up a spiral staircase) and stick the remote-control on.
No cheek/nose marks on the screen would be nice too, but i'm always reviewing shots so it would get tiresome flipping back and forward too often.
I'll certainly believe Canon if they come up with a way to make a flip-screen 7D2 with the same waterproofing as the current 7D model. But can they sell it for the same price?
The main reason I wouldn't buy one (on a camera that gets as much abuse as my 7D, if i were a 'normal' consumer I might consider a flip-screen more seriously), is the fragility. I've worked at the company that repairs almost every mobile phone in The Netherlands that breaks, and I've seen way too many clam-shell phones go through there that got sat on or walked on, even just fell shell-open-side-down onto the floor and bent too far backwards. If they can make on that can take a 'pro' level of abuse, I'd certainly consider it (even if i'm not a pro, sometimes i treat my equipment a bit like it).
An external LCD-screen with HDMI-plug, and hot-shoe mounted/powered (or battery powered) would be very nice and probably better for my occasional needs. I'm pretty sure they exist, but I don't need it often enough to justify more expense...