Rey's Hero's Journey Character Requirements (12/06/2017) [MEGA]

I would like to know what proportion of SWGOH players will have the requirements to play it, especially in comparison with the past Luke's hero's journey or Thrawn event (in its first appearance, which was not kind in terms of farming..).
My hypothesis is less than 1% of players, probably even less (1/500? 1/1000?)