In order for Skyrim to become a truely good online game, hundreds of new quests would have to be added, several systems including trading, probably player homes, so they would basically have to open up all of Tamriel for the game, make only the major cities and quests, and then let players construct things, plus there would have to be many servers, and considering the amount of lag skyrim (1/12th of tamriel) experiences, playing such a game without it being completely frozen all the time or constant loading would have to wait till at the very soonest the next gen of consoles, probably the one after, and that is assuming they are using the current level of graphics, anything better would cause extreme strain on the system, unless they start borrowing from the Just Cause project, lok at the significant difference in loading times between oblivion and skyrim!

Plus, if you think there are bugs now, wait until you see all of Tamriel opened up. There is a reason Maiq the Liar talks about why Skyrim isn't an online game, and it is that the sheer amount of work to make such a game with at least the play time for every player would take around 30 years to make, and then they would have to remake the textures and meshes for current gen consoles. I doubt such a game will ever be constructed, and even if it is, there is no way it would be until a game has been made for each of the races and territories. And then there will probably be a WAR OF THE FALMER game, because many players have already expressed wanting to know more about the war between the dwemer and falmer.

Be happy with the game you have, and the fact they will make more instead of spending many years making a game that will probably fall short of expectations.