I have some doubts this line will be competitive to car trips. I live in North and have some friends in Brooklyn Park and Center off of Bottiineau. With that said I don't see myself using this line. There is nothing along it out there. My friends houses are maybe a mile off of Bottineau. It's easier to use the car.Well, transit isn't a substitute for car travel because even if you can ride the Blue Line to your job at Target, you can't ride it to your friend's house in Lake Elmo or take IKEA furniture home on it.
I do think that "that the suburbs only enthusiastically supported the Bottineau Corridor so long as it didn't actually run in the Bottineau corridor" is somewhat accurate. Reports of how catastrophic the original Blue line was for people in cars reached the northwest suburbs and they don't want the same for Bottineau. Hiawatha has been mitigated a lot with better signal timings, but it's probably going to take more than that promise to appease the suburbs.
Elevating the tracks and station as opposed to the road might turn out to be actually more expensive, since trains require more sturdy bridges than cars, and pedestrian structures have to assume that pedestrians are packed shoulder to shoulder (or so an engineer working on the Winona Bridge told me), so the live load calculations can even be greater.
In Minneapolis there is better transit and density...out here this isn't a whole much. The airport doesn't help...it's all near the line and no one lives there.