As we move up north for the third part of our series, we look at the what may be the best and worst retractable roof stadiums in the majors. Milwaukee's Miller Park have seen a resurgence of the Brewers, but the Blue Jays have seen a steady decline since moving into Toronto's SkyDome (now Rogers Centre) 23 years ago. What this means, and what it may mean in the future, could have an effect on the viability of baseball in the north, for better and worse.