It is over twenty years since my government class at UT-Austin with professor David F. Prindle.
However there is a thing or two from the class
that remains clear in my memory from that day to this.

Regarding heads of government and heads of state.
Professor Prindle asked us to recall that many prosperous and advanced nations
in fact have one of each. In different iterations:
A prime minister and a constitutional monarch, or
A prime minister and a president.
One is head of government, and the other is head of state;
and the two are both in the public eye and both represent their nation, although not in exactly the same way.

Then, Professor Prindle noted, there is the United States
whose head of state is also the head of government --
and then Prindle shrewdly tossed THIS in:
"The only other countries that do this, have dictators in power,
-- BUTTHATDOESN'TMEANANYTHING!!" and swiftly changed the subject.
So the lecture continued to a silent filled-to-capacity lecture hall,
and I sat there -- silent and motionless --
with flashing red stoplights in my mind's eye.

How does my guesswork about the future
factor in this contribution from my UT-Austin professor?

I wonder if it might be possible for the electorate of the present USA
to be inclined toward either one of two things:
the present-day Chief Executive who is
both head of government and head of state,
with the centralized power that goes with it;

or, the model cited previously in this post and practiced outside the US,
in which there is one person as head of government
and another as head of state.
And here in North America, that would call for some changes.

Instead of the whole lower forty-eight, not to mention the other states and territories,
going all one way or the other,
could it be imagined that
our section of North America might be more than one nation with more than one government?

And, using the above contrasting pair:
one part of the former US would have one Chief Executive as before,
while
another part would have one head of state while
a different person would be the head of government,
which would result from a significant change of doing things.