The Kennedys and the Bushs tried to build dynasties; the Trumps are done cashing in and don't give a rat's ass about the Party. Donnie isn't going to do anything for anyone in the 2026 mid-terms.
Don Jr. has gotten too much of a taste for power. He's not leaving quickly and is just as big of a douchebag as Trump, and is a natural fit for cult succession.
Ivanka may be out, I'd believe it, but I don't think we're done with the Trumps.