From a climate perspective, they should be looking to extend the life of the dome for 30-50 years. Some here have said it's not feasible, but I haven't seen anything compelling to make me believe it. The 20-30 year stadium life cycles that have become the norm are ecologically untenable.
Having been to a lot of parks on the east coast, I find the dome of medium quality in terms of the fan experience. Obviously the turf sucks, but the experience is better than a lot of other parks. The climate control and central location are vastly underrated, and the aesthetic is overrated. It's certainly no Camden, or Fenway or Wrigley, but I much prefer it to the likes of New Yankee, Guaranteed Rate, or even Citizens Bank (a nice park that kid of sucks to get to and is located in an ocean of asphalt.)
I actually see the prospect of lower bowl improvements as really promising.