The Dems have real trouble going into 2020. Nobody appears to have one of the critical ingredients for success - charisma.
Beto O'Roarke has charisma and is gaining name recognition, but has not entered the race. The others are not personality standouts, even if I think they are qualified.
To beat Trump who has ample amounts of negative charisma that appeal to his deplotables, a candidate must arise who has standout charisma and appeal. Presidential races are like homecoming royalty or student council president, an extremely expensive popularity contest.