It is assumed that Archer should still do reasonable damage, even though you lose the additional spells from having a job. You'll be able to cross class every damage boost though, like the 20% dmg from Lancer, the 300TP from lancer also, the 20%crit from pugilist and Mercry Stroke which is an execute from MRD, 250 potency attack only usable when target is under 25%. With that said, even with the range advantage over a normal melee, I don't know if people will bother with archers over a THM who can aoe like crazy, never runs out of mana even without a bard in the group(pretty much every other DPS will run out of TP at some point on long fights) and is also ranged with a bunch of utility("shell", sleep, good Cure etc).
Also with BRD probably being in high demand, people will ask you to spec BRD most of the time as finding a DPS isn't really that hard. So yeah I'd go with Lancer/DRG for now, and get Ranger whenever they add that, or a Musketeer class that should come soon after release.