The Kennedy's are the closest thing the USA has ever had to a hereditary monarchy or "royal family".
Unfortunately the Kennedy brand name makes a lot of people blind to all their present day faults.
The Kennedys of today are not the same as those of 1960s that were assassinated.
In any case, any talk of potential candidates ia moot because no elected politician in the USA will ever reverse course of the absolute horrible societal mess the USA has fallen into over the last 30 years.
The corrupt system ensures that such a person will never be elected, or will eliminated (or humiliated) immediately if they somehow managed to get into office.
Only a foreign occupying military power, or an internal revolution/civil war will bring real change to the USA at this late terminal stage.
Any other hope of real change coming from elections is fantasy land for normies.
(Most of the western world is the same situation.)