We have avoided some of the worst case this election. Down ballot dems have done a lot better than for president and that's going to matter to keep them from being able to do anything without infighting fears. We could've been looking at a 57-43 senate should the swing states not have largely split their votes between senate and president. Instead we're likely looking at a 53-47 or 52-48 senate.* The house could've also been worse too.

In state legislatures, dems did fairly well all things considered. State legislatures are the place that resistance to Trump is most likely to really be effective. We've managed to keep a lot of state legislature seats and even flip some in other areas. For instance, we broke up North Carolina's republican super majority for instance which means the Democratic governor-elect can have effective vetos. We kept the 1 seat majority in the PA state house in a funny way of having two seats flipped in opposite directions and canceling each other out

*The Associated Press has called PA for McCormick, but Decision Desk actually thinks that Casey has a ~66% chance of winning still and neither campaign has conceded. McCormick is saying he thinks the call was incorrect and thinks things will could actually flip with the last 100,000 or so votes left to count and or may go to recount

EDIT: and to add on for further context, Decision Desk is usually some of the first to call any race - to the point where some people say their calls are premature. The AP usually calls races after Decision Desk. The AP usually is much more slow on their calls which is why this situation is so strange where the AP has called it but Decision Desk hasn't and thinks it actually has 2/3 odds of going the opposite way that the AP called it