A much better idea is to just prompt you with a once a life time choice.SE could have make a special button that bring everyone to 90 imo that would be the same, because don't tell me leeching in a PT 20 job is any accomplishment in it
Easy, Normal, Hard mode.
Easy is 250% exp bonus, 100% drop rate, Zone teleport.
Normal is 100% exp, 10% drop rate, limited teleport NPCs.
Hard is 10% exp, 1% drop rate, no transportation options.
That way everyone can play just how they want.
PS. Easy gets a free relic/mythic/empyrean. Hard gets blocked from the Ninja job and can't receive the effect of haste.