Here is a thought w/ 20 or so candidates in the mix, it is possible that none of them has the number of delegates to win on first Ballot, then a brokered convention and re-enter Hillary
Not even the Democrats are that crazy, and the Clintoons have lost a lot of their MoJo over their failure to nail Trump with Russian Collusion that they themselves tried to conjure up.
If the promised investigations into the Clintoon Slush Foundation ever come to be, they may be in an even weaker position by the time the Convention rolls around.
No, the old guard Democrats (SanFran Nan Pelosi, upChuck Schumer, DiFi, the Clintoons,) are losing their grip on the party, and the upstarts like Ocrazio-Cortex and the Muslim Sisterhood are taking over.
Harris will be the nominee, because she ticks more boxes for the Rabid Left than a Gay White Guy, a Fake Mexican White Guy, or a pair of Really Old White Guys do.(Don't forget that Shotgun Joe Biden is jumping in the race next week.)
A Black Woman it shall be. She is African American enough to keep the African Americans down on the Democratic Plantation, and she is Woman enough to keep the Suburban Minivan Liberal Soccer Mom vote.
Hillary might try but she has lost power so her chances are way down. Many are no longer afraid of her and they know there is strength in numbers.