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and I had a great desire to revive or rebuild a game, I think I would take a shot at Myst Online: Uru Live. It's an adaption of the Myst style of game, but taken online with other players. It's not an MMORPG, but with some work, it could be a decent MMO.
Some things that need updating are the controls, and game engine to make the game feel more modern. I would probably use the first person point of view as the primary point of view, with an optional third person point of view. I would add some better chat and player interaction mechanics, but I wouldn't change the game itself a whole lot. I'd love to start the game with the original Myst and Riven games, but done in fully interactive 3D, kind of like Myst Live.
It would never make money, I'm sure, but I'd love to actually do it, and play the resulting game even if only a couple thousand people played it. It would be disposable income after all. :-)
Why in the world did I think this up? Beau Hindman is doing a play through of Myst over at Massively.
A very close second to this is BattleTech: The Crescent Hawk's Inception which has become downloadable abandonware.
What about you guys? If you had enough disposable income, is there a game you'd like to rewrite or revamp for the current era of games?
I can not remember winning or losing a single debate on the internet.