If Memorial Stadium had been renovated, it would have stood well against any stadium in the Big Ten. But the football team didn't move there because the U wanted a domed stadium. The team moved there because the U was under heavy pressure to become a tenant at the Metrodome, and there wasn't going to be any money for renovation.
The U did attempt to sell recruits on the benefits of a domed stadium, but that is understandable. You sell what you have. If what you have is a domed stadium, you sell recruits on the benefits of a domed stadium. For a while it worked, but not for long. Some recruits expressed interest in "playing where the pros play", but the dome quickly became "where the pros didn't want to play."
Another big problem with a dome as a recruiting tool is that teams still have to play half of their Big Ten games on the road. And that means you're still going to play in the cold. If a player wants to avoid the cold, they can play in the south, and not have to deal with it at all.
There won't be a call for the Gophers to have a dome in 30 years. An NFL team might demand a new stadium in that time frame, but TCF is going to be there for an awful long time.