That argument is predicated on the basis that what is written in there is relevant to the twenty first century. Some of it is, much of it isn’t.
The system of picking SCOTUS Judges being a case in point for the latter, which has actually made the scenario you envisage more likely.
A system based on lifespan and capacity that was conceived when medicine was basically in the dark ages. How can that possibly be relevant today?
Your country appears to be slowly losing its sanity. Can’t people see all this division is going to end very badly?
I’ve said it before but I can see individual States wanting to secede from the Union in the next 20 years if this carries on, especially if the Second Amendment remains untouched, which it will, of course. Think there will be one or two at least calling for it. Maybe California. Whether they’ll be allowed to is another matter, of course. It would be a disaster for the US in terms of status, economics and the military implications could be catastrophic; that’s a lot of coastline to defend.
Not sure about civil war though, but who knows, I guess.