Well, whiskers,
To finish off the Fallout4 discussion... They should have made this game co-op, allowing a friend or another player to join in, taking your companion's place at any time (only in common-wealth they would be able to join in). It would be sort of like Gears of War 1 or on Fable 3 when you could join in and out of a friend's game any time you wanted. This would have been the ultimate icing on the cake had Fallout4 had a co-op mode where your friend could join your game at any time he wanted (using his character).
Heck, why not have the ability to let your co-op partner go into your world and modify your settlements as you see fit (while you are offline, with your permission of course. your friend must have access to be able to modify your settlements to be able to modify). Another feature... ahhh.. brain is hurting with such ideas.
Another idea... Interlinking worlds... Your world is now your friend's world, or vise versa. Whatever you do on your world alters your friend's world as well, and vise versa. Whatever they do will change and impact your world. Stay strong and make wise choices. Man I hope Bethesda is reading this, as my brain hurts. LOL
Sharing worlds with your friend in Survival mode....