I have been considering selling my setup
Interesting and refreshing anti "just get the best" post :-) ... the cf/sd card problem has been mentioned, but I also think that the 70-200is2 is over the top (price, size, weight) for many people and applications (look at your stats how often you needed f2.8 @200mm).
Personally, for the current price difference I'd keep the 24-70ii, except if you want the semi-macro capability that badly - but you can also do large magnifications with the tele zoom. As written above, you might loose some low light capability with the 70-300L, so it might be smart to keep f2.8 @70mm. If you want to replace your expensive standard zoom and save money, rather look at the Tamron.
I wouldn't recommend dumping your large flash, just get an additional one (maybe the 430ex2 replacement) because two real flashes allow for so much more creativity and the larger flash makes a big difference in reach outdoors (more power, 200mm reflector) and recycling time when bouncing. The on-flash menu system is also a big plus since you don't need to wade through the camera's flash menu.
The AF system with 61 af points is enough a reason to never go back to a 9 or 11 point af system
less re-compositing = more pics in focus.
... that is if you're not the focus & recompose type, the op will know. But the main advantage of the 5d3 is that the af is more precise with current lenses than the 6d, no matter how many af points are used.
I don't think you'd really save that much by switching now anyway, the 5D price has dropped quite a bit, while the 6D hasn't.
However, the 6d won't drop as much as the 5d3 because a) it isn't as overpriced to begin with and b) it is simply cheaper in absolute terms, so personally I plan to buy a 6d after the early adopters fee has been cut.