On the sideline going to the 20s, as a photographer, that removes another ten yards of real estate on either side of the field. I expect most schools will have to do some adjustments. Big money donors, photographers, cheerleaders, security and video crews all currently have sideline access. It already gets crowded. I'm betting they remove some of the photographer sideline passes. BMD is a BMD, but I've been to several games where BMD, trophy wife, and a couple of tween girls are on the sidelines. BMD is glad handing, trophy wife and tweens texting on their phones and none of them paying attention to the game. Always worries me that a play's going to come out of bounds and nail one of them and put them in the hospital.
Taunting and uniform violations, meh, they were already enforcing those enough in my opinion. Coaches leaving the sidelines will get interesting when they penalize one of the hot head coaches.
Penalizing faking injuries has to be a priority, but doing it is going to be tough. Referees can't be expected to make a decision about whether or not someone's faking an injury. Only solution I could see is charging a time out anytime an injury stops play. If a team is out of time outs, it could be a delay of game. It's not fair, but neither is expecting a referee to be a diagnostic physician.