Second US Republic

[American2020]

Scenario: there's a revolution which overthrows Trump and dissolves the Congress and the Supreme Court. The transitional council decides to cancel the 1787 Constitution and organize a national convention to write a new constitution for a second republic.
The new constitution establishes a parliamentary republic, with a prime minister holding the power, all secretaries are parliament members. There's a president, with only a representative role. There's only an house of representatives, the senate is abolished. Also, the GOP and Democratic Party are dissolved. Many parties are in the house.

Other things:
BLM becomes a party
A new national flag and anthem
Proportionnal system
Huge Bill of Rights
New National Day
...

How plausible this scenario will be ?

[Stuart98]

Fun to speculate about but could never happen; constitution worship runs too high even in liberal circles, let alone conservative ones.

[GlobeSoc]

Unlikely, but if it was to happen it would probably happen in the context of a full scale but short civil war that the left wins, probably because trump seized power illegally in the lame duck period and the military sides with the democrats as a result, demanding a reorganization of the political system to block the republicans from power. A sprawling guerrilla war would continue in rural areas throughout the country. Although the military would demand the inclusion of conservative forces in politics, in all likelihood their role would be severely diminished as the left dominates legitimate forms of political discourse and power. Socialists, greens, and progressives would form a left wing bloc, while mormon interests, christian democrats, and social liberals would form a centrist bloc. Some minority interest parties might include the aforementioned BLM party, which would presumably be a catch-all of left-leaning black people, latino socialists, and a minority conservative party. The "true right" of this period would presumably be a mixture of republican front parties and hotep types, having 2-5% of the parliament but nonetheless trying to muck things up as much as possible. This republic would be vulnerable to a military coup itself, and socialist forces would be surging in strength too. It isn't likely that this republic lasts very long, and a second, much more divisive civil war is likely. The left would be likely to win that struggle though, just because of the time bought during this second republic.

[Agonized-Statism]

Impossible. A "civil war" would play out more like a coup with the winning faction commandeering the existing US government. Also, it's missing the point and a little Tucker Carlsony to say that BLM would become a political party when the idea is that ending police brutality shouldn't be up for debate.

Sadly, the American people don't yet have an appetite for a legit revolution. None of our institutions, or even our identity, would come out of that the same. You're proposing a slightly more moderate US.