Too much free stuff is promised by them from the tax payer to render them irrelevant.
Keeping the House is a tall order, but even that will only buy us 2 years (and none of the liberal SCOTUS Justices will leave during that time). The real damage will be done if Trump is reelected in 2020, and brings with him gains in both houses of Congress.
The demoncrat party may lose next Tuesday but they are not going away.
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I think the biggest question is: when will rational thought come back to the Dems?
How long will they let the extremists rule the party? When are they going to Deep-Six Bernie and Elizabeth Warren?
How many defeats will it take to bring them back from the brink of idiocy?