I hope the 70-400 is a replacement for all of the 70/75/100-300 non-L lenses that are pointless now.
I can understand having cheap EF zooms back when film was the bread winner, but the 55-250 is better than the 75/100-300 lenses and is custom tailored (and low priced) to the crop Rebels. Anyone who has a FF camera would be crazy to put 70/75/100-300 non-L lenses on it, so why is canon still making them?