Personally i believe Fallout New Vegas would be great with a little multiplayer mod since the game is well balanced and show how much Fallout 3 was broken. I believe it would be possible with a well balanced Spawning system like 1 player - 5 mobs 2 players - 10 mobs 3 players - 15 mobs 4 players - 20 mobs Why so many?.... Because we all love Wasteland Battles and it would require tactic and wisdom to overcome the odds in battle! Numbers of mobs spawned per group would varies from the Server Difficulty OR from the type of mobs your fighting? I know it would be insane to go against a group of 20 Deathclaws unless we have deathwishes. Just to say that Fallout New Vegas would be a game stable enough to handle a 4 Players Multiplayer , more then that would make the game extremely unstable Personally i believe it to be possible to make a light multiplayer game from Fallout New Vegas and give in a Fallout Tactic-ish experience to the game. With enough hearts and effort it might be do-able. Respawn System? Well if you die you reappear in front of the house of Dr. Mitchell and your body turn into a "Wastelander" Body with all your stuff on it, and once looted it dissapear.