It would absolutely lose a lot. There are no good domed stadiums, so you'd have to figure out a way to build one that isn't lame. You'd also have to figure out a way to pay for all those rebuilds when the rare instances where weather is a problem doesn't come close to justifying the investments. The Yankees and Red Sox play in just as much crap as the Cubs do every April and most Octobers and their fans find a way to actually enjoy being there regardless. Crappy 45 degree games in April suck when your team sucks, they suck a lot less when your team is good. Cold games suck regardless. I imagine they also affect walk up ticket sales pretty significantly as well. I don't care if the team looks like a contender or not, I plan my trips to Wrigley in the summer, regardless of the price/availability of tickets. Cold, gray April baseball sucks any way you slice it. How they put an open air stadium in a place like Minneapolis still boggles my mind. And there are good enclosed stadiums. Enclosed =/= domed. There aren't/weren't any good domes, but they are a becoming a relic of the past. Safeco is a nice place to see a game, not every enclosed stadium has to be Tropicana Field or Rogers Centre. I think down the road we'll see architectural innovations that make enclosed stadiums even better and more common. Target Field is gorgeous, my 2nd favorite behind PNC.