The cons for Democrats:

They could lose a one-time opportunity to tar Republicans with the damage their ACA replacement plan would have done to millions of people, according to the multiple analyses that showed lost coverage and higher premiums for vulnerable people.

By campaigning on their own sweeping health reform plan, Democrats could give Republicans a fighting chance to change the subject.

More targeted policy ideas, such as Medicaid buy-in options for the ACA marketplaces and a Medicare buy-in for 50-64 year olds, could also be popular on the left and the center, while offering far smaller targets than a sweeping single-payer plan would.