Everyone and Mercs (Npcs) should require food, water and protection to survive and equipment should require maintenance and even buildings repairs from misuse (fights and time)
This means you need workers to provide services to warriors and they in return have to defend you, otherwise will the faction settlement or the major settlement they work at, fail to produce the basics for survival.
Now the point here is not to annoy those who wants to kill everyone else, but to provide a more realistic future in Fallout online... and if its done right, then there will be progress, but if everyone blasts away then will ammo become scarce for higher tech weaponry along with lack of food, will cripple people in the long run...
but before food runs out entirely, then should mercs begin to desert their masters, so forcing players to defend their positions themselves or ensure they have workers for the fields!
but again, thats just my thoughts on that