It is not the political agenda but the system and the Constitution. The US is a Constitutional Federal Republic. The UK and its dominions have a Parliamentary Democracy, conceived in its "embryonic" form by Henry Plantagenet in the thirteenth century. After the second Civil war of the Cavaliers and roundheads instigated by Oliver Cromwell at the restoration under Charles II it rapidly evolved, and continues to do so.
Those Constitutional democracies have all come to grief pretty much at one time or another. The Parliamentary democracies of the UK and its Dominions have proved much more stable.
I fear the US democracy and rigid constitution has run its course and will end up on the ash bin of history like so many before and since.
I know this is radical, but I think the US would be much more stable moving to a Parliamentary democracy. We did assume English Common Law and not Roman Law after all. So we might as well go the "whole hog."
France is on its 5th Republic, ie:5th constitution, having had a series of constitutional crises over the last 200+ years since its revolution (and a brief stint as a constitutional monarchy)... it might be time for a revamp in the US (!)
although the US system did have periodic amendments....
But the reason for revolution in the USA vs revolution in France were very very different.
The USA was conservatives unhappy with the management and taxation regime - so the constitution ended up (relatively) conservative... (as in: keep the status quo, don't change too much, the literal meaning of conservative)
The French revolution was more of a scrap it all and restart, build a new paradigm - which then had to be adjusted more substantively (although USA and France were clearly checking out each others homework!) - generating complete renewals 5 times over...
How dire will it need to get for the USA citizenry to get behind a completely new constitution?
Getting people behind even a constitutional amendment, would be a long hard trek... let alone a new constitution. Last major update/amendment was voting age in 1971... more than 50 years ago! - and that was a result of debates that kicked off in WWII... it really took it 30 years to get passed.
I expect there will be "blood in the streets" before this is sorted out.