Time will tell. this information is not yet known.
As i said in another thread, we don't yet know the extent of the GoD impact; they say vitality affects drop rate of items, they may have increased the item drop rate for levels 1-85, they might introduce adena through the daily exp quests...
Time will tell. this information is not yet known.
However in principle its still fairly easy to make adena in L2; you just have to do THAT instead of going out hunting.
Or you have to be an 83 dagger and have a zillion maestro keys.
Generally adena from the NPC is the most reliable, so drop trading and mass spoiling can make a substantial adena amount in a short time; like spoiling in varka/ketra and NPC'sing the keymats. its some cool cash in hand and doesnt waste time sitting selling.
So if anything i think the new vitality system actually will help adena growth for lower levels despite terrible adena drops and inflated exp rewards.