The All-Encompassing Pro/Rel Thread on Soccer in the USA

So here is the one-and-only thread on this forum dedicated to the pros and cons of ditching the current system in the United States and adopting promotion and relegation between different leagues/divisions.

Everybody is allowed to post here. Anything I deem relevant to the conversation is applicable. As the moderator of this forum, I am the only person who gets to decide what is appropriate for this thread. That means that I don't want previous conflicts between posters from other...

The All-Encompassing Pro/Rel Thread on Soccer in the USA