I can see people buying this for the Super duper dual pixel autofocus, while using some gigantic expensive fullframe zoom on an aps-c body.
While on my trip last week I saw at least 5 70Ds,many smaller canon eos XXX. a few small old nikons (d3000,d5000,etc...), tons of bridge cameras ,a few 5D mkiii (young japanese metrosexuals), and a few m43s olympus and fuji used by old fellas. No wonder why Canon doesn't see a reason to do better.