I have mixed feelings about this. Personally, I love the Joe. It has so much character, history and the sight lines (IMO) are great. Even in the upper deck it feels like you're on top of the action, and the standing room areas are superb.
While the idea of a new arena is also exciting, I can't help but feel it will be another generic, state of the art place where everything is overpriced and you have to bring binoculars to the game.
This^ but if they still let the upper bowl peeps go down to the glass and take pics, etc. then it won't be so bad.