Here's a interesting question.
If you were in charge of the DNC, what would you do to try to win 2028? do you stick with Moderates? lean harder into the left?
I don't think they have a winning move for 2028. It's MAGA's election to lose.
What they need is the thing they'd resist the most, worse than going full prog and poisoning their national chances, and worse than going hard moderate and turning off the young indealist they've stuck in dead end positions in the low level local offices of the Party.
They need their Trump. Someone that isn't part of either faction, the establishment or the progressives, but hits hard on a central position that they both agree on enough, that they can over look smaller positions that upset either side.
The progs crave power, they will tear the party in two before they get sidelined. I think that's what the coup with Kamala was, the younger idealists forced her to be the candidate where Biden was suppose to open the way for an establishment candidate. The establishment put the party into this position, ensuring no charismatic outsider could step in and steal some of the profit of the corrupt money laundering system they made, they however are fat on pork and old enough to start dying off, they don't have the energy to fight for a better situation for themselves, and will probably just let the progs win and let them take the blame for blowing up the party.
I think they have the candidate for this though, which would be an incredibly unusual circumstance. There is a potential for 2028 to be between two members of the outgoing administration:
RFK Jr versus JD Vance.
He's an old white man, he'll turn off the low propensity progs, but not all of them, and it's probably the candidate that can pull the hardest off the center to have a chance. If he accomplishes some major things that will get him cred, and then fueds with Trump to get kicked out over bad blood, that'll wash clear a lot of the stink of working in his administration.
But those in charge of both sides of the party probably won't let him.