spoiler alert: i linked this
Sources say the Metropolitan Sports Facilities Commission is assessing the viability of playing the 2011 season outdoors at TCF Bank Stadium at the University of Minnesota, the stadium that hosted the Vikings' game against the Chicago Bears when the Metrodome roof was damaged by heavy snow.
I think that would actually be pretty cool (no pun intended), and the Vikings could actually spring for some upgrades (eg, turf heaters). The biggest drawback, aside from being outside in Dec/Jan in Minnesota, is that it would be far and away the smallest NFL stadium at 50,805. Soldier Field is currently the smallest with an official capacity of 61,500. I know some are on the side of moving back outdoors, but Lester Bagley - Vikings VP of Public Affairs and Stadium Development - is on record as saying that it's "not an NFL stadium." Then again, as VP of Stadium Development, he's probably not doing his job very well.