I agree with you that 4CC is undergoing a gradual upward trajectory in prestige. In the past, some Americans skipped it and passed the "honor" on to lower ranked pairs/skaters. Of course, Ashley Wagner didn't go this year... but I think that has more to do with preserving strength for Worlds than discounting the importance of the championship. I still think an American skater would still choose to be National Champ over 4CC Champ.
I think Euro is probably more prestigious than 4CC, but that is because of the long fabled history. 4CC has a lot of ground to make up there.
a Canadian skater probably also would prefer being National Champion than 4CC champion.... ask Kevin Reynolds... not sure I am right... but yeah...
Now... IMHO and YMMV
Olympic games > Worlds> here, I beg to differ with GPF : simply because if it is quite a fantastically difficult event to win, in theory, it's less difficult than "Open" championships like EUROS and 4CC... The thing though is that GPF is the big closing event in the fall.... finishing the season of GPs... but, it's not Yuri on Ice here... it's reality and Europeans and 4CC to me, place ahead of GPF.... because it's a competition including many more countries.... fine, some top competitors may be missing.... but to me it has the added cachet as well as the skaters who do compete have done their nationals, and are there to represent their countries.... GPF, they are there for themselves.
So OG> Worlds> ISU championships (Euro and 4CC) GPF/Nationals... some skaters would argue that being a national champion is more important than winning GPF. I am certain of that, but it depends of the country of the skater. I am sure Javi would prefer winning GPF. GP? Challengers etc...
It's an interesting discussion in how we perceive things being from different countries. I would be interested to hear how the skaters themselves rank these.