Dems won't change their strategy and probably won't have to, because after Trump is past his term limit the Republican party will be back to offering up wet noodles like Jeb and Romney, who won't be able to persuade the working class to vote. Against weaker less charismatic opponents, the poor strategy of the DNC will matter far less.

And everything will continue to suck for the working class. Trump won't actually succeed in fixing much of anything for them, even if he tries, and nobody else is even going to pretend to care. The DNC will continue to be the party for yuppies that sneers at uneducated working men while the RNC takes off the mask stops pretending to care about anything besides the managerial class and Christian/Zionism issues.