I have a couple of long-standing dream games:
1. The Open-Ended Mercenary Game:
A true spiritual heir to Pirates! is long overdue. I never understood why more people didn't get that open-ended mercenary games were a winning concept. Sid Meier's original Pirates! game -- and its various later editions -- was digital crack: most especially the original version, which was perfectly balanced between ship-to-ship combat, swordplay, land battles and trading. (I will confess I could have lived without the ballroom dancing simulator and the "stealth game" addition to Pirates! Gold.)
There needs to be a new game about piracy on the high seas that broadens its focus beyond the Spanish Main. After all, the real pirates of history operated in all the world's oceans. A game that lets you be a buccaneer on the Main, or a Barbary corsair, or a Malaysian pirate or a Japanese freebooter raiding the coasts of China... that game, correctly done, would be incredible.
This applies to more than just pirates. The original Mechwarrior game likewise had an open-ended fight-for-hire feature -- which made perfect sense in the Battletech universe and was frankly far more fun, and had more replay value, than the game's "plot." Yet this, the game's best feature, got ditched in subsequent Mechwarrior titles. What I wouldn't give to see an open-ended mercs-in-giant-robots title once again.
2. A Century-Spanning Superhero Epic:
I actually have a rough outline in place for a game like this, with the working title Burning Bright: following the career of a long-lived superhero -- longevity is one of his superpowers -- from his (and the genre's) origins among the latter-day pulp heroes of the early 1930s; through his World War 2 adventures and subsequent battles with communism and a period of semi-retirement; into a Silver Age career that starts out bright and optimistic and even a little campy, with his own super-family and even a super-pet to back him up, and then tacks into the dark and confusing waters of the conflict-ridden Sixties and the cynical Seventies; through his period as a tough-as-nails deadly spy, assassin and avenger in the late Seventies and early Eighties... and so on, culminating his career with one final adventure, a mission to stop a white supremacist plot to kill the first Black Presidential candidate in 2008.
The character would be an East-meets-West concept, a combination of the science-ninja-hero and Western detective who's equally at home with Taoist alchemy and modern forensic chemistry. He'd meet and mingle with a cast of thousands -- heroes and villains, fellow heroes who become villains and make it back to the light again, a succession of sidekicks and associates that the player can choose, and a host of mundane allies, friends, acquaintances, informants and enemies -- his powers and skills growing more subtle and diverse with the passing years, the difficulty level of combat gradually increasing as age begins to catch up with him even despite his superhuman longevity and supreme fitness. It would be a stealth / beat-'em-up game -- in the style of the Arkham games, or perhaps more comparable to Arkham Asylum-meets-Deus Ex -- with a whole century of missions and locations to choose from.
The concept is probably too huge to work as a single game, is the problem. Unless one built the game starting with one era and sold the subsequent eras as DLC.
Unfortunately, I have zippo in the way of coding and visual arts skills. So these ideas are likely to stay on paper unless I can find people who want to work with those concepts and have the skills to actually realize them.