Thanks to those who actually responded to the question (I was like 10 comments in before I got to an actual answer lol.) It's a shame that they have done away with the decorative paper tickets... the collections some folks have is really neat.
The card will be fine for now, but if they eliminate that, I'm going to be annoyed. I'm plenty tech savvy, but all the tech savvy in the world can't change the physics of how phones react to heat, cold, impact, or even water. That plus you all know how the network reacts near the stadium when people begin arriving. If they ditch the cards, hopefully they'll be smart enough to replace them with something else that isn't battery dependent. If not, the lines are probably going to slow way down as technology struggles occur at the point of scanning.
Anyway, thanks for the info. Go Bills.