You asked, here it is. Michigan Stadium with an upper deck (concept).

Awesome work!

Needs a retractable roof. Also you call that a lining? Yuk yuk

Sorry, demand has already maxed out.  Already many thousands don't show up for each game.  And that's people who have already purchased tickets.  With the current public health situation, even fewer people will be coming out to games.  

Love it.

Even if the actual stadium is never expanded, the look of adding the three-story Romanesque arches all the way around the stadium is magnificent. 

I know attendance is an issue across the sport in general (especially with public health concerns), but this type of expansion would allow the AD to lower ticket prices at least in the nosebleeds so attending the games can be more accessible to families/etc. Higher capacity allows the AD to reduce ticket prices until they are low enough to legitimately sell out every game and still end up with increased overall revenues, especially when considering all the additional concession sales and the like. 
 

Traffic would suck even worse though. 

That upper deck would be really really far away from the action. Being in the end zones, the fans are even further away than the sky boxes. 

Needs more halo.
-TomGoss

What would seemingly make the most sense is decks that bracket the current screens on either side, helps trap noise and probably take capacity to like 120k which feels more feasible (its not really feasible) than 150k

I'll bet many UM traditionalists will hate it and to that I say stop living in the past unless you want UM to be a has been, which it kinda already is.  I love it.  I bet it would hold the sound in much better and make the stadium much louder and give a better home field advantage.

That's pretty cool, though I don't see it happening.  My main concern re:the stadium is crowd noise.  I hate seeing us and other teams succumb to the road environment at Camp Randall, Ohio Stadium, Beaver Stadium (especially during a White Out), or Kinnick Stadium.  We have so many fans but not that intimidating a home field advantage due to the open air.

My favorite idea instead of a deck or fully-encased press boxes is a quarter or half canopy that wraps all the around.  No need for a dome or roof, but a canopy like those around soccer stadiums in Europe or seen here in the states at Husky Field (Washington), Century Link (Seattle Seahawks), Autzen Stadium (Oregon) or McLane Stadium (Baylor).  Covers a decent amount of seats from the elements, making rainy or snowy games more tolerable without eliminating the elements from the field itself, and would make for nice shade during warmer seasons.  But most of all, finally trap the sound of 100,000 fans and bring us to par with the other tough places to play in our conference.