I was thinking, there are so many games that I loved when i was a kid that are no longer around, worse, the genre isn't even being produced.  Most of these genre's are also, sadly escaping.  If I was king of the world, here is how I would make them comeback:
Space Ship Flight Sim:  Wing Commander - this series was awesome, and now there is nothing like that out there that I can think of.  I would port these to Xbox live, or make a new one.  The new consoles have analog controls and more than enough buttons to swtich shields and weapons.  That would be awesome.  A new Rogue Squadron would be cool too, that was just about the only reason to own a gamecube.  Heck I might throw mine in my Wii just to revisit it this weekend.
Point and click adventure:  I keep thinking these old point and click adventure games would be PERFECT for the iOS, android platforms.  I had hope that more of these would come back after Myst was released, but, sadly they have yet to come back.  I would LOVE a Sam and Max on the iPad, and Kings Quest would be great