I think the doom-and-gloom promoters are almost entirely comprised of liberal democrats who are still in a state of shock and outrage that they lost the election: so outraged that they are in effect trying to *bring about* doom and gloom by "conjuring it up" so to speak.
..........
Liberal democrats so badly want President Trump and the Republican congress to FAIL that they're actively trying to make it fail by spewing false information, creating fake news, organizing protest marches, etc., and fomenting divisiveness when things are really... just fine, and getting better.
..........
It would blow the entire liberal agenda and platform out of the water if our economy continues to pick up, if we make our borders more secure, strengthen our military and our relationships with allies, and continue enjoying this blessedly peaceful interval between Islamic terrorist attacks on our own soil (knock on wood.)
..........
That's my theory, anyway. All the moderates and conservative republicans I know are feeling pretty optimistic now, it's the liberal democrats who are having chronic tantrums and predicting disaster. I just tune them out and get on with things.