Some thoughts here...
We already have electronic ticketing. This is something everyone (or almost everyone) needs to use their phones for. The vast improvement in Internet access should make that work a lot more seamlessly.
Some stadia provide the ability to order food and drinks from your phone. I think that will eventually be coming to the dome. Even if you could only do it for pick up, that could be a difference maker for hungry and thirsty fans.
I like to follow the scores of other games going on while I am at games. Especially during football season. How are the Mets doing? What about the other big ACC games going on? Other big games in the rest of the country? This is something I check on during timeouts. At least I try to check on. Internet access has been so bad it is almost impossible. Would love to watch highlights from the games I am interested in or even to watch part of a game from my seat. Especially before our game starts or at halftime.
Would love to be able to access a good stats package during football and basketball games. See how many yards Sean Tucker has. See how many yards the other team has rushing and how many sacks our defense has so far. That sort of stuff. The Cuse app has a nice stats package for football but Internet access is so bad it is unusable.
The Cuse app has quizzes I would like to participate in. Maybe some of the social stuff where they ask you to post pictures. My nieces really like that kind of stuff. Hard to do with crappy Internet access.
Sometimes I need to check my email, usually for work.
I have lots of friends and they send a lot of texts before and during games. I would like to participate, mostly during time outs. But I can't even get texts, especially if there are pictures, inside the dome. most of the time. That would be great if this finally got addressed.
If our game is televised, I would like to hear what the experts are saying about it before kickoff and at halftime. Also after the game. It would be great to be able to hear post game pressers while exiting the stadium.
Lots of places have 50-50 raffles. Most are done electronically. It might be nice to participate in these.
Maybe just send a few pictures from the stadium, a video or two.
Would love to be able to make and take phone calls for emergency situations. Would love to be able to sign into work and fix a problem from the dome like I can from home.
There is so much that is possible that we have been prevented from doing to date. The lack of access to the Internet has been my biggest issue with attending games at the dome for years and I am really excited it is finally going to get addressed. Even if I have to buy a 5G phone to take advantage.