Responsible government refers to a government that is responsible to the people, not their Political Party. The government responsible depends on the support of an elected assembly, rather than a monarch or their representatives.
We must look and plan ahead. We must have legislation which has definitely been forecasted by a party's agenda and sanctioned by the public voice. Instead of the present arrangements for compromise, piecemeal legislating, we must have coherent plans from recognized party leaders, and means for holding them to a faithful execution of those plans in clear-cut Acts of Congress.
The oldest and simplest justification for government is as protector: protecting citizens from violence. After the January 6th attack on our democracy, by republican party supporters, I do not feel confident that the Republican Party agenda is to protect ALL of its citizens. However, if you are wealthy, and it's your money not your country that is important to you, you may feel differently.
While the support base of the republican party may have changed, it is still the party of the rich.