As far as other people know. Probably. Because they have so many people who like Fallout New Vegas, that if they make another one; everyone would want it. Hope that will get you exited! :)
Yes. :)
In my opinion Fallout New Vegas is. In Fallout NV it is easier to make caps so you can buy better wepons and ammo. In Fallout 3 It's hard to make a lot of caps in the begining making it a slow start. But is you want to test your skills play Fallout 3.
now
No, you can only craft, find or buy the dart gun in Fallout 3.
get a girlfriend
Here is what Pete Hines said about it. "The whole reason we went out and acquired the license and that we now own Fallout is that we clearly intended to make more than one. This is not something we're going to do once and then go away and never do it again. When that will be or how long that will be God only knows, but we acquired it specifically because we wanted to own it and develop it and work on it like we do with The Elder Scrolls."
I personally recommend Fallout 3 to any other Fallout game. Fallout 3 has a more organized and in my opinion interesting storyline. And you. And you can also keep the game going after you beat the main quest on Fallout 3 if you buy the DLC "Broken Steel."
i don't think so, Bethesda are concentrating on fallout new Vegas now !
Fallout: New Vegas
Occasionally Fallout: New Vegas will freeze, but not as frequently as Fallout 3.
There will most likely be a Fallout 4. Also, there are plans for a Fallout Mass Multi-Player Online Game (MMO) but the rights of making the MMO are under the legal debate between Interplay (Makers of Fallout 1,2,Tactics,Brotherhood of Steel) and Bethesda (Makers of Fallout 3 and publishers of Fallout:New Vegas). Also Bethesda purchased the rights and now own all the rights (legally debated) of the Fallout Franchise and told reporters that they were going to DEVELOP at least 3 Fallout games (Fallout 3, Fallout:New Vegas, and Fallout 4, which is far from being released). There will probably be more Fallout games (hopefully because they are my favorite games, Fallout 3 FTW!!) and they will probably be developed by Bethesda.