The fresh faces will all bow out, they know 2024 is the time.
The Democrats will be stuck with Hillary or the Idiot Biden.
Yes, it could well be, that these Democrats are not wanting to go up against Trump in 2020. They may bide their time till 2024, when there is no incumbent Trump running for reelection.
And historically, the party out of power has a better chance of winning election, when there’s no incumbent running for reelection.