Realistically, what kind of a crowd is this game going to draw in Detroit or Washington? Can't imagine more than 30% of the season ticket holders would go to Detroit for a weekday night game, near 0% for DC. Then, how many people in Detroit are going to fork out full dollar (would be unfair to season ticket holders to deep discount prices) to see a non-lions game.
Ask yourself this: same storm hits Motown and the league moves Lions/Vikings to the Ralph? You buying a ticket? Me neither.
The 29,000 UB Stadium seems like a much better solution. Drove past it an hour ago. Trace amounts of snow, parking lots clear.
Make tix available to season ticket holders based on longevity.