A Democrat movement to Resist the Trump Agenda can bury the Democrats deeper in 2020.
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What Democrats need to fear most is Trump accomplishing his agenda in the next 4 years. 
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For one of Trump's agenda was the promise he made to Blacks and Latinos during the election ----  bring Blacks and Latinos into the mainstream economy.
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Latinos and Blacks, although long ignored and neglected by Democrats, would begin supporting Trump when Trump begins fulfilling his agenda to help Latinos and Blacks get into the mainstream economy.
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Democrats who do not recognize this very fact of Trump's agenda, thinking that Latinos and Blacks are their bread and butter, would discover in 2020 that the Latinos who gave Clinton the popularity vote majority by winning over 61% of the vote in California would desert them for Trump in 2020.