I agree that players need something "to go for" .. Because when they have everything they need, the game starts to be boring, because they have nothing to do there anymore.
But this varies..
Some people like PvE and so they want new dungeons and areas to overcome, the harder - the longer it keeps this kind of people interested.
PvP is another major part of every MMO, especially in FO. People obivously need to win sometimes, cause dying without any chance of win starts to be boring very soon. I think PvP is fine here, maybe add few locations, where players can go for PvP and they know they will find it there.. I mean some fair PvP, not camped warehouse / reno =) But anyway, when player gets killed, he has a decent chance to find someone else to kill and that will satisfy him enough to play more.. PvP players are much more likely to stay interested in game than PvE players..
And in my case, i have a little bit different problem.. I love the game, i love killing people, i love that you loose your equipment, i love sound of gatling killing a person.. Theres many things why i love Fallout.. BUT, the combat system is getting boring for me. I played single player Fallout a lot (1,2,tactits) before i found FO. It had one big advantage - you could play however you wanted and you was able to win. This doesn't work in FO.. Lets be honest, in FO there are 2-3 effective character builds and that makes playing extremly boring for me.. Real time combat? Bursters win it... PvE or PvP, burst is a key to victory. TB combat? Fast shot (1AP/shot) or burst again, doesn't really matter what weapon/ammo you have). And thats it, thats how you HAVE to play, in order to be able to catch up others. And this is what makes game extremly boring for me. Im playing FO for 2 months maybe (i know, im rookie), but even after short time, im starting to lose interest in it, even if i love it so much. More goodies or wipe doesn't solve anything for me, cause this won't change it. This is not a complaint or crying, i can catch up a little bit, but of course, with burst or fast shot.
Solution in my opinion? More builds... Melee, Thrower, Sniper, Leader (followers), maybe more.. which can catch up to bursters and fast shooters in PvE and PvP.. That would bring a lot of fun. Players would exp new chars, farm more, pvp more.. it would keep us interested much longer.
Just my opinion =)