First, it doesn’t matter what the democrats agenda is. We now have an imperial presidency, a senate that is utterly corrupt, and a SCOTUS that will back any and all fascist decisions coming from either. Even under those circumstances, circumstances where the democratic leadership could easily adopt a far more liberal agenda with no fear that it would ever be enacted because of the above gridlock mechanisms, they won’t even consider it. The last thing that Pelosi, Durbin, Schumer, and their corporate Clintonian ilk want is to give any quarter to the coming progressive tide.
Second, all of this supposition will be for naught, as Pelosi is all but a shoo-in to be speaker once again. Investigations will begin in earnest of course, as the democrats have by one plan now. They will spend the next two years with but one goal, disgrace Trump even further and hope that the Rest of the GOP still give him enough tacit support that they go down in flames with him. The shame of this is that Trumps predictable downfall will all but guarantee that the democrats will win control of the POTUS, senate and House in 2020 with the same center/right leadership they have now. There will be no bold progressive agenda, and any attempt to even try to implement one will be blocked by the all powerful SCOTUS and the nation will in turn contiune to flounder for another generation.
(BTW, Thomas will step down early next year. Another younger, even more fascist justice will be placed on the court, and short of the revolutionary act of disbanding the SCOTUS, the USA will be run by fascists until at least 2040.)