I think it's fruitless because they're not expanding beyond it. Undoing the Trump administration will just bring us back to where we were before the election. They need to push ideas of universal health care, justice system reform, and the wealth gap.
While Hillary's campaign focused way too much on that "look what he could do" part the campaign was still more complex and involved than that. She actually had written policies available for people to read and comment on. She talked about them in her speeches and interviews.
But once the GOP picked their nominee she figured they had gotten their message across to the voters and only needed to call out the bull in the china shop. She thought voters were smart enough to do their research and realize that literally nothing that been presented by her opponent in terms of policy to argue again. She was wrong.
The democratic party's failing is partly in thinking that all you have to do is present facts about problems and potential solutions to them. That kind of thing does not work on the average "everyday people" that go to the polls. People vote on their feelings, most don't care about policy or at least don't know any specifics. The politician that can make the voter feel either more hopeful of them or more afraid of the opponent has the advantage.
What's the solution? Fight dirty? Appeal to the ignorance of the masses like the people who believed in obamacare death panels? The party platform is clear, the voters are having trouble deciding how far left to be and the party is failing to find any leadership capable of taking a stand one way or the other. It's disjointed just like the GOP was in 2009/10 but in this case the latte party hasn't found a concise message.
I dunno man, but it ain't simple. And people like simple. "Fuck Donald Trump" is simple. It sucks.