I don't think one person should be in control of a DXCC entity.
I have sympathy for this argument, but it would need to be carefully developed.
I can think of several DXCCs that are effectively
controlled by a single operator right now: 5T, 3C, 3C0. Making that argument naively, all look to me to more-or-less qualify under the "single operator" standard. I can't make the case for deleting them, though, so the "obvious' rulemaking is out.
I haven't heard of Jean, 5T0JL, blocking other hams from getting a license to operate from Mauritania. A Polish team went there in late 2012.
I don't know who you're referring to with respect to 3C and 3C0.