The most likely outcome will be alternating administrations, whether legit or not, that abuse the executive to the maximum. Congress will drag their feet when they have a small conservative majority, and pass millions of pages is insane corruption when they have a small leftist majority. SCOTUS will have 60% bad takes while completely ignoring the most important cases. The US will progressively alienate its neighbors and allies, driving them into the arms of whatever other power is most convenient.