I think you have it all wrong. The Democrats are positioned to blame any ill effects on the Republicans. If they walk away and a second recession hits then the Democrats will blame the Republicans and say they did it just to protect the rich. The media will give them cover and the Republicans will go further into irrelevancy.
The Republicans need to anounce everything that they believe needs to be done to help the economy and then step aside and let the Democrats have everything that they want. Let the Democrats own the results in a way that they cannot deflect. Only when they own the damage can we hope to start moving back in the RIGHT direction.