an argument about communication is fruitless as pretty much every console either comes with a headset or headset compatible.
and ab argument about not enough keys can is bunk. an example that comes to mind is castlevania order of eccalasia (yeah i know thats probably spelled wrong), you could have upto 9 different abilities at any one time and they were just organised into sets which were easy to shift between,
applying that to a pad would be even easier, look at the xbox, lets say the two analogs are movement and camera, then lets assign A to the "interact key" this leaves 3 buttons a d-pad and all shoulders, so if the skills are set to the d-pad then thats four sets with a skill applied to X,Y,B. so thats upto 12 skills right there, without even using the shoulder buttons,
so really there isnt anything really stopping a mmo from going to a console over then people automatically dismissing it because it "wont work"