OP need to read YoshiP Post ^^
2 or more job for each class coming in 2.0

anyway u can already do... WAR tank? Rampage. WAR DPS? Berserk
Monk? Kite - dps - off-tank
White? Buffer (with equip VIT) - Healer (with equip MND)
Black? DPS or CC
Dragoon? maybe the only pure dd
brd? dps sub-healer/buffer
pld? tank

enough?
please learn your class as well