2 point's I'll be hitting about this:
1: Next to Normal wouldn't have been successful if it had come this year unless this version focused more on Natalie. Most of the shows that teens like nowadays follow the same model: "Attractive" Main Character likes X. X doesn't like them, and the main character is unpopular. They're in high school and they do Z to get popular so they can get X, but eventually, it blows up in their face. Main Character is "punished" for their means of getting X, whether it is socially, internally, or physically, but in the end, they get X anyways due to the necessity for a happy ending. Even though next to normal in theory has that plot, it is too tangled in with the Gabe and Diana plot to cater to this fanbase.
2: Broke teens seeing the show wouldn't take their family. Their parents might be forced to come with them, but if they were able to they're be going alone. If in theory the older half of the fanbase will gain the ability to go and see this show alone, the parent base would shrink. And even on the site, nobody would take their little siblings considering the show is 12+. The youngest person in the theatre I saw was about 10, and clearly a giant fan.
3: Not addressing anybody specifically, but if this theoretically went to the Lyceum, they would need to beef up security as well as rush policies, because within the first 2 weeks there was a boot of the show flying around, which proves security wasn't as thick as everybody thinks. The Lyceum has 950 seats, versus Diamond's 294 seating capacity. With over 3 times the amount of people going to see the show at once, there is bound to be more of a rowdy crowd at the door, and even at the first preview, the barricades fell over. Imagine 3 times the amount of people all crowding, not to mention those who stop by to the door daily because they live in the city and walk past to meet their favorites without seeing the show.
All in all, I'm still seeing this if it goes to Broadway, it'll just also be against what would be better for most people involved in the show: New World Stages year-long run.