Appreciate your thoughts, popo. Always nice to hear different views
I see the weather sealing as more of a bonus, even if it didn't come through like that. What what do I plan to do? Not completely sure tbh.
Here's my original thoughts:
5D2: A camera which will always be with me, for general photography and video, and of course for the stuff only full frame can do. Then I would need wide angle coverage for it (at least the 24-105)
50D: Make it a "specialist" camera for action photography, I guess mostly used with the 70-200 and 100-400.
600D: Make it a "specialist" camera for tele video with the 1.6x crop and the 2.7x movie crop function on top of that (mostly coupled with the tele zooms)
If I don't get wide angle coverage for the 5D2 it will not become the general camera I wanted it to be. Then again, as you say, do I really need to move everything to full frame? I don't mind a two-body setup as I've gotten used to it with the 50D & 600D.
Difficult times

I guess I should use more energy shooting and less energy wondering

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Canon DSLRs: 5D Mark III, 7D
Canon lenses: 17-40/4
L, 24-105/4
L, 24/1.4
L II, 50/1.4, 85/1.8, 100/2.8
L Macro, 70-200/2.8
L IS, 100-400
LOther stuff: Canon Extender 1.4x II, Canon 580 EX II, Canon 430EX II, Velbon Sherpa 600R
Apple: MacBook Pro 15", iMac 27", iPad III, iPhone 4S, Apple TV
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