Correct me if I'm wrong on the publicly funded portion of the U's stadium... isn't all the money funded from the state a "bond" that actually needs to be paid back? That was my understanding. And just because the U is a public institution does not mean they should or can be forced in to letting the Vikings use their stadium. If Target Corporate needed to demolish their HQ to put up a new one, would the government offices downtown or the U's empty office buildings (if they had any) be forced to let Target use them? No. Not even if Target offered or was required to pay for the usage. The U can evaluate if the deal works for them - logistically, can they handle the traffic, noise, security, etc, strategically - is it the right move to have seats added, changes made, the image, etc, and benefit-wise - is the money they pay enough to cover costs and then some (obviously stewardship to local companies and other sports teams weighs in here on how much "profit" the U should make).
The Vikings have multiple stadium offers on the table between the Corridor site, Arden Hills, Shakopee, and current Dome site. There is only 1 that requires playing at a different stadium. The burden is on them to recognize that even though playing at TCF may not be as good financially as if it were upgraded or they played elsewhere, their alternatives may cost just as much, and the worst alternative (for them) is leaving MN entirely.