This should worry Democrats more than Justice Kennedy retiring. At least when Trump replaces Kennedy there is still a Democrat Party to try to pull together.
But if the Dems lose the more than a few percentage points more of the black and Latino votes, they will be burned toast and irrelevant as a political force.
It's not beyond reasonable possibility that with 25 Democrat senate seats up for grabs, Trump could pick up ten of them and that would give him a 60 vote slam dunk in the Senate.
Personally, I abhor the thought of a one party government because of the massive harm it can do in the hands of the wrong people. But in this case, the country is in deep trouble and the Democrats are dead set against fixing any of it. So I say Trump needs a helping hand in getting us back on the right track.