Just China and Korea versions are being made.
There is no way Mir will re open over here again, Huge user base in China and Korea for games like Mir but over here it's got no chance anymore.
If the game was kept updated like the CN and KR versions, ran by a competant company, AND it was this new jizz-in-your-pants new version of Mir, it would definitely retain more than enough players to be profitable. I remember having to log off of Dragon server and play on Pheonix because D was too packed back in the day when original Mir2 was considered a good quality game (for the time I mean)!
If it was launched over here it would definitely do well. Hell Mir3 would've done well if it was kept updated. I know I wouldn't of quit anyway.
Look at how many people in the west play Conquer and Eudemons currently, hell even Diablo3 (I saw Mir as an upgrade to Diablo 2 back in the day), then combine that with the fact that the server code isn't leaked, so no private servers.
It would definitely do very well, there is no 2.5D MMO up to the standards of that version of Mir currently.
Suppose the only problem is, if it was released over here we'd see the likes of WeMade.net (NOT the same company as the Korean developers for anyone who doesn't already know) or JoyMax publishing it. Eurgh. I'd still lap it up in an instant though.