My idea of a workable co-op experience would not importing your character from the singal player game. Rather, co-op character would be seperate from the singal player game all together.
The co-op play, would consist of 4 to 6 different classes. To prevent lag, the entire world of skyrim would not open online. Just a castle that gets upgraded via moeny and loot acuired through raids, which you can save up and buy an arena for and eventually build you own city that people online can come and vist. The loot you dont want you can have it be sold through your mercenants. Thus, it would be like your own personal auction house.
This would create incentives for you and other people to visist and raid with other people cause they need either mats or equipment for their own character or city. In stead of having a big open world full of needless space just have the same set up that LOTRO has for instances. Just gotoa menu, select the instance and bam your in.
Then, the city you built from online co-op make it an avaible city in your singal player game. Full of loot for your singal player to buy that will inturn help the cities encomy to buy other stuff for upgrades. i can go on and on on my dream co-opexperience but i know atteh endof the it will never happen andall icando is dream



