Seriously who would level from 30 to 60 only with fates? The only people that do this are botters, A mix of daily roulettes, dungeons and fates is still the fastest way to gain XP( except for quests of course).
Really i hope for the mentor system to have more influence on the FFXIV players, to help DPS that do way to bad or tanks that cant hold aggro. Well maybe the beginner tanks may benefit from it but from the sound of everyone no one expects any influence on DPS that dont know how to do DPS on their job. But, well, i guess itll just become a way to populate dungeons and trials with XPed players throu the mentor roulette. There go my hopes away.