One thing the Ralph does need, inarguably, is A LOT of structural work. Concrete and freeze/thaw cycles do not a good relationship make. If I remember from the last discussion about the upgrades, they've had to do a lot of "band aid" work on the concrete supports especially in the last couple of years.
I think that would be a huge part of any retrofit project like what was done at Soldier Field, Lambeau, even Gillette and Mile High Stadium, or at some of the older baseball stadiums too.