I think the College of Winterhold felt short, perhaps The Isle of Artaeum will be the 4\5th big DLC?
Because I feel the magic quests\storyline in this game is a bit lacking, right.

So would you want to see The Isle of Artaeum as a big DLC for Skyrim? Would be easy to get there, thru a magic portal or something. Doh!
And don't you think they can cook up something good with The Isle of Artaeum + Psijic Order? Maybe not, I don't know. What do you think, honestly?


History
Around the end of the First Era, at about the time of the founding of the Mages Guild in Tamriel, the isle disappeared entirely, only to reappear 500 years later. Members of the Order who were thought to have died when it vanished reappeared as well, refusing to reveal where Artaeum had been during its time away. The Isle of Artaeum disappeared again approximately 100 years before the civil war in Skyrim. It is also stated that the God King and member of the Psijic Order, Sotha Sil, visited the island at the end of the First Era.


Geography
Artaeum is said to have idylic orchards and pastures, the still and silent lagoons, the misty woodlands, and the unique Psijic architecture that seems to be as natural but wondrous as the surroundings. The Ceporah Tower, a structure built by a civilization several hundred years before the Altmer, is one of Artaeum's more prominent features. The Isle has no set shape. It either shifts or changes at random, or by the will of the Council of Artaeum.

Your not the only one. A lot of people have expressed interest in the Eye of Magnus and The Psijic order as a DLC/Expansion.

Yeah, I would like that but I am afraid we won't have it, or we will but as part of mage guild in next TES think about it , this would probobly requiered mage guild to complite to make sense, but all that said i think theres still chance for explanation of great collapse in next dlc , or maybe even in Dragonborn as a sub plot ( that said I would prefer whole new dlc about it even if it would be as small as hearthfire)

I dont think they will add a DLC that's tied to finishing a whole guild. Todd has always said that they put stuff out there for the player to chose and play, not force it on us.

I can't see them making a dlc / expansion set on the island which is all the way on the other side of Tamriel for a game called "Skyrim".

A majority of people are predicting that the next TES in the series will be featured in the Summerset Isles and will conclude the Thalmor story so I'd expect this then.

Due to the letter from the Mages Guild to the Jarl of Winterhold which features in the game I was curios as to whether the collapse had something to do with the island of Solstheim due to it being mentioned. Plus the waves would have come from that direction. With the new expansion soon to be released we will see if there is any connection. Hopefully they will build Winterhold into a proper city similar to the way Raven Rock was build in Bloodmoon.