So the lesson they'll learn from their electoral ass-kicking is not that they should have shown at least a little backbone, stood by the legitimate accomplishments of their president -- who, whatever else you want to say about the guy, did get elected twice, fair and square. No, what they'll take with them into the next round of the perpetual campaign system is that they weren't Republican enough.
It's estimated that over $110M was spent on the North Carolina Senate campaign between Kay Hagan and Thom Tillis alone. Especially since the "vulnerable" demographics who typically vote Democratic couldn't be bothered to show up, why and how exactly are Democratic candidates supposed to espouse policies that would benefit those groups? They'll never be part of the donor class, and half the time they don't even vote. It's a self-fulfilling dynamic.
But in an environment where the outgoing Attorney General might as well have been in cahoots with the thieving financial industry, it matters less and less. None of the losing Dem Senate candidates would have changed that; not one of them would have held the fort against predatory banks, or greedy oil companies wanting another pipeline, or kept another abortion clinic open, or anything any actual liberal cares about.
The ratchet-pawl system will continue apace, and the etiolated pseudo-libs will engage in the usual hippie-punching of any perceived dissenters who might be thinking about Elizabeth Warren. They will expend profound amounts of energy lecturing what's left of the left on the Importance Of Settling For Hillary, and nothing at all for their erstwhile compadres who, just as they abandoned Gore for Bush in 2000, will waste no time going for Jeb or Ted or Rand or whichever grinning psychopath runs against her.
And people like Al From will still get paid, because that's what they do.