I'm not sure if that's really possible. At this point Phoenix is supposed to be an omnipotent cosmic force and a protagonist with omnipotent powers is pretty hard to write.
Maybe Marvel should then hire better writers who can find a way to write Jean without always resorting to the same old gimmick. Maybe even *gasp* write Jean as a competent and strong yet human character!
Because that IS always a possibility.
Or maybe Marvel should challenge their writers more by denying them access to the Phoenix. It's a lazy plot device/Macguffin at this point and really should be shelved because nobody seems to be able to do anything exciting with it. Just look at Secret Wars where Doom wiped the floor on Phoenix powered Cyclops. When your supposedly omnipotent cosmic force/entity starts to suffer from the Worf Effect and is demoted to getting it's ass kicked to show how powerful the latest villain is it's time to stop using it.