See I have a problem with...
I'd prefer they do away with the adventurer class, make the Knight, Bard, Wizard, Alchemist, and Merchant classes have bonuses, no deficits. Upon rebirth you may choose a specialized class, or remain class-less. Classes could be just an extension of races in a way. There could be new Class-specific skills, but prior content skills are uneffected. A Knight unlocks Down Attack, a Wizard unlocks Hailstorm, and a Bard unlocks Lure of Ballad. Of course there'd need to eventually be a ranged and alchemist specialty skill, which could be iron-ed out before release, or in a latter update (like giants getting Taunt and Windguard further down the road, elves getting Final Shot).
T_T