What happens at U11 then, 6v6? What cannot be right would be to go from 4v4 to 11 a side at U11. It also needs somethinking about.
Personally, although possibly at odds a little with other on here I believe you need to starting upping the amount of players on each team to perhaps 7v7 at U10.
Whether anyone likes it or not, it still needs to be acceptable to the masses otherwise good idea or not it won't fly and everything will just stay the same.
Just my thoughts, not meant to stir anyone up, just trying to be pragmatic.