I just added the 5D3 + 24-105 f4.0L IS to my collection. (The 24-105 with IS will be more useful for me than the 24-70 without.) The 60D is relegated to the kids along with an 18-135. But, I'm keeping he 7D for sports/second body with the 70-200 f2.8 II.
I most often shoot with two bodies (I hate changing lenses). For outdoor sports, I still anticipate using the 7D with the 70-200. For indoor sports, I expect to use the 5D3. I love the 70-200 for indoor candids at events, even though it is sometimes a little long for crop. But, I expect it to be even more useful on the 5D3.
In the short time that I've had the 5D3, it is easy to see that I will favor this body over the 7D most of the time. I may still end up switching lenses more than I did with two crop bodies just to keep the most desirable lens on the 5D3 for the given situation.
I hate to say this already, but I can easily see myself wanting a second 5D3 down the road and limiting myself to three lenses for most events -- 24-105, 70-200, and the 40.
Bottom line, it's way too early for me to give up on the reach (not to mention buffer and FPS) of the 7D for sports. Time will tell.