With a newer, more transparent FIFA leadership, MLS should be allowed to make subtle rules changes to its game, like the NBA does for basketball. The NBA puts its own twist on how rules are applied, deviating from FIBA, the international arm of basketball. For example, FIBA rules allow players to knock the ball off the rim after it touches the cylinder. The NBA considers this to be a goal-tending violation.
Under the old FIFA guard, any changes without permission came with threats of 'rogue league' status and consequences to players (see 'History of Rules Changes...). Now, MLS is a willing guinea pig for FIFA, ensuring that VARs (video assistant referees) get the calls right during a game. So, with a more modern, contemporary relationship with FIFA, MLS should have the leeway to do other rules changes to ensure its game gives audiences the best suspense possible.
If soccer adapts this NFL rule, electronic scoreboard keepers up in the far reaches of stadiums should have to stop the clocks (I also say take the timekeeping away from the referee) on soccer balls going out of bounds. And, if stopping the clock on out of bounds plays are initiated, it would just behoove MLS to take another step forward with regard to the last two minutes of the first half and the last five minutes of the second half. Why not just stop the clock on all dead-ball scenarios, such as direct kicks, fouls, etc... (Essentially, the NFL does this too already.)
Lead changes are such a rare occurrence in soccer (there were none for all of America's Cup and Euro Cup), what could it hurt for MLS to try and get more of them? People become fans and watch sports because of the thrilling nature of 'lead changes.' In practical terms, it has to be one of the biggest reasons for why sports fans love American football, basketball, baseball and hockey (the big four). The drama from watching the 'big four' keeps the audiences guessing.
For fans of soccer, when there's a lead, there's less guesswork involved.