I've been wanting co-op since day 1 of fallout 3. My friends and I sit in the party and play fallout together and try to keep up with each other inside the story. I just wish we could actually be able to play with each other through these amazing quests! Please I've been wanting co-op for so long it's 2015 and people love to interact with each other through games. This isn't Nintendo 64 days when we are forced to play single player.
Just have a single player and co-op mode. So if someone wants to play single player then go play by yourself and have fun, while people who want to play with they're friends can do so as well!

Thank you Bethesda if u actually read all this!

You can discuss Fallout multiplayer and co-op here: http://www.gamesas.com/topic/1512524-fallout-multiplayer-discussion-thread/