Ideally, we'd make Lambeau a stadium with a retractable roof. I really don't think that the weather conditions in Wisconsin really help us that much. Same goes for a team like the Bills. They have such cold weather and such strong winds going through that stadium that, at times, you pretty much can't pass the ball.
Then again, the biggest thing is making money. A retractable roof is horribly expensive and every single game at Lambeau is sold out, anyway.