Just doing the maths here; Currently, Emirates A-380 economy seats have a width of 18" and a pitch of 32-34".
To accommodate 11 across would mean reducing the seat width to approximately 16'5", plus narrowing both aisles. (10 seats reduced by 1.5" each = 15", plus approx 2" reduction in each aisle width = 4", giving a total of 19", allowing for small arm rests.)
Not acceptable for me!