Very interesting article, but what will happen if that cover film will be broken in some part by a meteorit or by bad weather?

If you read comments to the post, the proposed solutions are: self-healing film for tiny holes; baloons that move with the air flow and plug the holes with their bodies for medium holes; and evacuation to a safe place for a huge holes once in a century. It is a Russian blog so most ideas reside not in the article but down in comments :)