Neither Buttigieg nor Fetterman will or should run. For different reasons each would be unelectable. Other than maybe another try by Klobuchar, its probably going to be somebody not being thought about yet. Newsome may try but will would fail in primarys.
Aside from his goofy wardrobe, Fetterman would be vulnerable in a Democratic primary on Israel nowadays (he wouldn't have been, say, 20 years ago or mabye even ten). His health would also be a legitimate concern even though he seems to be functioning okay now. It's one of those things that's always there.
Mayor Pete has assessed his chances in Michigan after removing his pronouns from his Twitter page and still opted to not run. This, to me, is like Beto O'Rourke's stock rising and then his refusing to run for governor in 2018 or Senator in 2020 - but deciding to run for the big job.
Dismiss all polls showing "Harris and AOC are on top", they're all based on name recognition at this point. Harris is not going to be the nominee again given she wasn't their first choice last time, and she ran a less than stellar race.
But I'll throw in with you on something, too. Most Americans had never heard of:
- Jimmy Carter in 1974
- Michael Dukakis in 1986
- John Kerry in 2002
More Americans had heard of Bill Clinton in 1992 both because he'd given that long speech in 1988 and then appeared on Johnny Carson after that debacle with good humor. And a decent chunk of Americans had heard of Obama in 2007 because of his 2004 convention speech coverage.