All these are reasons why it's not coming to Wii because it won't work. They will make little to no profit off DLC on the Wii after the hard work of having to port the maps to the Wii. And since Activision is a big business the will not want to risk it.
Seeing as how a hacker could just make a new profile or change his name a report system would be completely pointless.
5v5 is stressing the Wii enough already so they will not make a 6v6 because it will break even more wiis.
Heck all this stuff is old news and has been brought up countless times.
None of your ideas are new. Why am I even typing this when you could use the search topic button.
Have a good day Sir.