Morrowind is nice because of quests, the only reason to install Oblivion (before Skyrim was out) was to download Morroblivion mod later and play Morrowind in Oblivion engine for those who dislike old graphics and want new combat system, there were no other use for Oblivion, as its quests, environment and story line was fail, they would get more success if they just recreated Morrowind updating graphics and making combat more diverse.
As for Skyrim, they tried to make it more interesting by adding repeatable quests (who ever will do it in single player game?) and a lot useless stuff in game that took them days and weeks and may be months to implement, but it getting boring in 1 minute, or even less, a lot stuff that suits multiplayer game, where others can see you doing something and see your progress. But still Skyrim, the same as Oblivion and Morrowind, Fallout 3 and FNV, require plugins/mods to be playable and enjoyable. So it's just raw products for modders to allow them make their own game.
Also if compare all TES, Daggerfall is much better than Morrowind, yes, it has boring quests (like all repeatable Skyrim quests), but character building, as one of the most important things in RPGs, was much better than in Morrowind and obviously Skyrim. Skyrim's character building was buffed by perks and also debuffed by removing stats, poor devs explained it by saying "You just click INT to get more mana, so why don't you just raise your mana instead?", stupid idiots forgot that there are modders who will do it better than they and make it more complicated, so now it will need more work for them to restore attributes back to make character building better, than it is now, but I don't think they ever will do it better than in Daggerfall (btw Daggerfall had some kind of perks too, that you picked at 1st level
), so they just degraded at Morrowind and now they are returning back, but still they are worse than before, and for character making Daggerfall beats Morrowind, Oblivion and Skyrim. So Morrowind isn't that perfect.
As for Skyrim online - it's good move, because they will use it's name to insta-raise popularity for this MMO and get a lot money, but also they will need to change their team, whole team. Or else they will need to make it not MMO, but some game with "instances and rooms" where people will be able to play it with their friends, and be able mod and do everything themselves, because without modders they will just make raw MMO, and how people can mod MMO? Also it'll have some % that it'll crash after each action or if you'll alt-tab and there will be a lot bugs and other bad stuff... no, they really don't need to make MMOs.