The reason the Constitution needs either amending or a complete redo is that it may not be robust enough top survive attack by determined political party that is willing to fight dirty. The Constitution was designed to prevent tyranny, by forbidding authoritarianism and instead giving power to the majority of the citizens, but then restraining the power of the majority to the extent it violated the rights of the minority. It must be said that it is the Republican party who is trying to violate the rights of the majority, by claiming falsely to be winning elections despite only having a minority of voters, and by establishing autocratic rule. Because the Constitution is designed exactly to thwart these goals, the Republicans have attempted to steal elections, suppress the vote, politicize the Supreme Court, and finally resorted to armed insurrection, to hold onto power they could not earn at the ballot box.
It is more accurate to say that the country is becoming more divided and more polarized than to say that "the pendulum is swinging to the right." Since the Democrats are the majority and the Republicans the minority, Republicans have decided to lie, cheat, steal, and violently attack the government in order to get their policies implemented.
The Constitution needs to be changed, if only to make it less vulnerable to such attack.