As for Yankee Stadium, I went to the old one in 2005 and new one in 2013. Wasn't paying attention at the time to how far it was from CBD in Manhattan.
When checking google maps it looks like about 7.5 kms to Empire State. Too far for an intimate view of the skyline, but possibly still visible.
When I was in the stadium district of Philly, only then did I realize how far it is from DT. Looks like about 5.5 kms. And that looks like this:
http://www.espn.com/mlb/team/stadium...lphia-phillies
Yankee Stadium is farther but Manhattan's skyline is taller. Regardless, there's probably infrastructure and apartments that would obstruct the view anyway even if they had turned the stadium around.