The bag method won't come in for about a month or 2. But yes, it will suffocate the plant. It will suffocate slowly so you'll be buying extra time as opposed to cutting them and starting the dying process right then.
I am concerned for the success of this grow. The roots are as important as the canopy. So if your doing the "out of sight out of mind" thing, You might get burnt. You might want to think about picking 5-6 of your best looking and transplanting them to smaller pots.
I'm only concerned over the things that can ruin a whole crop. rootrot & budrot.
I've explained enough about the rootrot.
budrot occurs when a bud doesn't get enough airflow. If it starts, your in big trouble from what I hear. And your starting to look like your aiming for jungle. 1 plant ready to flower is about 1' wide * 1' tall. Then flowering you can expect 2'*2' sometimes 3'*3'.
Get a 12" ruler and start predictions, You'll see my worries.
Another thing is, when 2 leaves touch for too long, they create an incubator of heat and moisture between the 2 leaves that usually leads to a mold or fungus. I've dealt with this on several occasions. The cure is simple if caught early, Just cut off the infected leaves.
But if left unnoticed, it could get bad quick.