I think Kamala's dead in the water after the Biden withdrawal debacle in 2024. Not saying he should or shouldn't have withdrawn, just that it was handled badly and many people are still not completely happy with that.
AOC, as much as I love her, has a snowball's chance in hell, Mamdani's election was due to the fact that NYC is a 'microcosm' of semi-socialism. AOC will still be considered as too 'radical' for many Dems as well as at 36 too young by TPTB in the Dem party. They not only need as many Dem voters as possible, they need to win over independents and disaffected GOP in the swing states, many of which are either purple or 'lean red'. The electoral college system means that it takes more than just the popular vote to win.
Gavin fits the bill, but I'm not sure even he could win the swing states, although I think he has a better chance than Kamala or AOC.
We'll have to wait til after the midterms to really see which way the wind will blow. If there's a Blue Wave with a good number of more 'hard left progressive' candidates winning in certain states that may open the field a bit more for the Dem nom in 2028.