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There are some MMO's with simmilar setting the "best" of them is Face of Mankind and its pretty bad.
The MMORPG market today is threading water so i doubt well see many more big budgest MMORPG's which are not expanding on an exiting franchise/fanbase.
Dues Ex does not have a large enough player base to justify the investment that could produce an MMO worthy of the franchise sadly.
Any judging by how things are progressing now most of not all games with in the next 3-5 years will be MMO's/MOBA's either trough the game it self, or trough a presistant social network of some sorts.
WoW will still hold the large majority of the MMORPG market even 2 years from now, the problem is that most of the subs the lose do not actually move to a new game, many of them either quit the genere or hop trough every new title out there trying to find a new home.
I must say this must be done properly to work, if they can't capture the essence of DX then I would rather they leave it as it is and do not further ruin my favorite game of all time ( Original Deus Ex ).
There are two glaring examples in the MMO industry, one existing and one coming up that I think would have been better left alone if you can't capture the essence of what made the IP so great.
One is LoTRO, the game is good but apart from the fact that the names of everything are taken out of tolkien's books it really failed to capture the Tolkien universe, it was a WoW with LoTRO on top sort of game and that doesnt fit the way the world works, this is not about whether the game is good or not, its about whether it fits with the tolkien universe and it just doesn't no matter how you put it.
Another one is TESO, I love the idea of TES going MMO/adding co-op but while I give them credit for trying I think they will fall short of the mark of actually capturing the essence of the TES world. ( This is irrespectiveof it being good or not )
another "Why not make an MMO set in the X universe"
Deus Ex is one of those games that exists to tell a story. The characters and atmosphere exist to fill in the details. It's a game based around narrative. While I would not call it a linear game strictly speaking, the player's path is very constrained. This ensures that the player sees and hears everything they're supposed to in the correct order so that they are able to take in the whole story.
MMOs are almost the complete opposite. MMOs are about the player and his or her own accomplishments, as well as their interactions with others. This type of game has very little to do with experiencing a set story. You could put the world of Deus Ex in an MMO but it would be a completely different game because the reasons for playing it would be completely different.
I LOVE Deus Ex .. very good SP RPG. However, i do NOT want to see it made into a MMO. I do not really see it adds much. May be adding a co-op mode with infilration missions with a small group.
Having 100 players around will just destroy the stealth/hacking aspect of the game.
Not every good setting should be made into a MMO.