Not sure why it's not showing up in my profile, but I live in Michigan since someone asked. We used to have the excellent Frankenmuth ('pride of the Franconians" in German) brewery which was a mid-sized brewery that produced the best pils I can ever remember from an American brewery, as well as a range of other German style beers. They sold everything from bottles, cans, mini-kegs, and full kegs, but it burned down in the early 90's. It re opened a few yrs ago as a brewpub, but only selling beer on premesis. I haven't tasted anything from the 'new' brewery but I'm told it's quite good.
Why am I telling you this? Just so you know where I'm coming from and that indeed there WERE good mid-sized brewerys producing lagers in Michigan! So, that being said, I fail to see why a brewery can't do the same thing nowadays. Don't get me wrong, we have some GREAT brewerys here, but like I said earlier, I'd like to be able to buy a good helles as easily as I can an IPA and if Frankenmuth did it yrs ago, I can't see why a mid-sized brewery couldn't do it now.
What's even more frustrating to me is that when a brewery DOES have a light lager available, it seems like they're just making something so that a Bud drinker can stay and drink rather than producing something a true beer lover could appreciate. This isn't true in all cases, as with Prima Pils and others, there are some great lagers out there! However, they're far a few between.