Excellent analysis of the purpose of the filibuster. Removing it will radically upset the dynamics of the Senate. The unintended consequences are bound to make even Democrats mad.
The Democrats believe they can move to full socialism in a massive legislative blitzkrieg: the New Deal 2.0, Great Society 2.), Green New Deal, single payer health care, open borders, gun confiscation, comprehensive racial quotas, sweeping censorship via "hate speech" regulation, etc., all rolled into one. And they are counting on there never being another competitive election in the United States. Their model is the one party system now existing in New York or California. That is the new norm that they intend to impose.