I doubt we are going to see many, if any, fans at CFB games.
I think that makes a temporary dome structures possible for winter ball (perhaps could still accommodate some fans or family members, etc. Travel to existing dome structures (not a terrible idea) would cost most and have more logistical issues. And it wouldn't feel quite as right.
Check out what Harvard did for their stadium. I think we could do something like this and incorporate some of the stands in A deck, possibly.