Funny you'd say that. They just completed an expansion project on highway 10 & 694 that improved access to that whole area. 35w is already at 3 lanes north and south through there, game day traffic would not even be close to what is typical for normal rush hour.
On top of that, all the beautiful people could come over via 610/highway and not even need to use the route from MLPS. They could have arrived to the site from the north, the south metro fans could have come up 35w and the east metro could have come down from 694/10. Other than possibly adding an additional flyover from 35w south to access the northern part of the site or using the county road that buffers the northern side of the development, the need for road improvements was greatly over played for the site.
Building away from the core downtowns, with development such as this stadium would have been, is not a new idea, see Dallas, new Braves ball park, new Niners park. It's all of a 15 min shot up 35 from DT, so it's not like is across the state. It would have a positive influence for everyone.
Unless you count the environment, more wasteful/unproductive road building, or any other negative associated with our current pattern of development. I've got my criticisms of how the Vikings Stadium as designed for downtown interacts with the neighborhood (not to mention the $45m car-storage structure and skyway the public is building to further subsidize driving as a mode choice), but downtown is a much better location. Even with professional sporting events only taking place 10-12x a year. Any other activities it can hold (MSHSL, conventions, baseball games for local colleges like... you know.. the U, NCAA basketball games, concerts, potentially an MLS team, etc) are more centrally located and are better fits for an urban environment. There are plenty of NFL stadiums located in or near downtown cores: Cleveland, New Orleans, Charlotte, Baltimore, Pittsburgh, Seattle, Indianapolis, Cincinnati, Nashville, Atlanta, and Cleveland all have stadiums within miles (or directly inside) urban cores. While many of them may be just across a river or freeway, or have "bad urban design," the point that locating them where more people can easily access them still stands.
So you're saying Met Stadium destroyed downtown Mpls?
Not by itself. But the pattern of development that supported Met Stadium (roads roads roads), the fact that one could only (reasonably) access baseball and football games if they owned a car, and the other ancillary development (offices/restaurants/housing) around it that could have been incrementally added to downtown and surrounding neighborhoods all aided the decline of downtown Minneapolis.
I think in the end we can all agree that the way the Wilfs & Co have treated the U is indicative of the way they likely negotiated behind closed doors (and, well, out in the open) regarding their new stadium in general. Completely abhorrent. The Falcons are managing to pay for a new stadium with far, far less public money. We should have been able to secure at least the same deal.