If it helps, I would expect a peaceful transition of power in less than three years - from the President to the Vice President upon his death, at which point yes, I fully expect two full terms of Vance provided he doesn’t screw up this initial one by getting caught up in the chaotic fracas of the inner cabinet. The American People made it clear that they demand the sacrifice of “others” for their personal wealth, and that’s the agenda for the remainder of the decade.
That being said, I can’t say how outside forces could shape things in unexpected ways. A proper WW3 with China and Russia could devastate enough of the world that countries with large immigrant populations end up the new superpowers, isolated from global conflicts and with the population for large projects, quickly. Or it might not. There’s so many potential branches when the status quo fails or is destroyed, that our only reliable sources of data come from those who lived it before us - lived through WW1 and WW2, who witnessed the Holocaust, who resisted fascism and totalitarianism from within and without.
I hope this is a crisis we manage to navigate largely peacefully, educating our masses about a better future together and form a new, achievable American Dream for them to chase. I want us to stop debating ideology in echo chambers, and instead put in the hard work of teaching, and guiding, and helping our fellow man. Pull the socialists, and the communists, and the modern economic theorists, and all the “fringe” groups out of their fortresses and into the streets, exchanging ideas with one another and formulating a real path forward that recognizes we will all have to compromise something to achieve our goal of a better, brighter, more sustainable future together.