Why Don’t the U.S. Soccer leagues have promotion/relegation?

Since the re-brand over the last two years to the “Championship”, “League One” and “League Two”, why haven’t they yet adopted promotion and relegation? Surely closed divisions make for a less exciting season? Eventually looking at Championship teams gaining promotion to the MLS. Will this ever be implemented or... show more Since the re-brand over the last two years to the “Championship”, “League One” and “League Two”, why haven’t they yet adopted promotion and relegation? Surely closed divisions make for a less exciting season? Eventually looking at Championship teams gaining promotion to the MLS.
Will this ever be implemented or isn’t it a thing the U.S can really embrace?
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