I'll be keeping the old cameras primarily so my kids can learn to use them.So... are you planning on having four camera bodies? 2x7dii, 20d and 5d? Then you wouldn't really be going back to all crop would you?I'm not planning to sell either of my current cameras.I would keep the 5D. You cannot sell it for a price that would compensate you for the benefit it brings.
Yes, that's the plan. But even with crop-only, I could do that just by having different lenses on the two cameras (i.e. 18-35/1.8 on one, 70-200/2.8 on the other).For me personally, if I had two cameras and was using them side by side (not one as a backup), which I don't have by the way, I would want the two cams to do complementary things. So, I would probably go with a 70d or 7dii and a 6d or 5diii. If you want pretty much the same setup on each, you could do either 70d and 6d or go with 7dii and 5diii (although that comes at a huge price jump). Anyway, that's my 2cents
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Lee Jay