In addition to the great article, some more thoughts:
Most games that are released today follow these maximes:
Accessible - easy to learn (but also hard to master...?)
True for Civ4 to some extent, this must not be negative at all, but it has the potential to leave games "dumbed down".
Multiplayer - often also with the "PvP" (Player vs Player) component. MMORPG's like World of Warcraft also heavily borrow from this formula. While I enjoy multiplayer games, take a look at Quake 3 e.g.. - extremely short and unsatisfying Single Player mode. But fortunately some really good single player shooters were released, too... some even had a rather good story. I really like Star Wars Jedi Academy or whatever the name was.
Accessible multiplayer games of competition - but where is the Innovation?
WoW, DAOC, EQ, UO, SWG, AO, all those MMORPG's are very similar, UO and SWG being somewhat different in the basic system, but all in all, it is always the same "Level" based, experience-grinding gaming experience.
The Sims sell well... basically "Virtual Alternate Reality". I wonder how long it takes for Civ4 to be the last bastion of hopefully a bit more complex, turn-based gaming in a slew of MMORPG's that fail to innovate and the 1000. RTS-game a la Warcraft3, Games that go back to Dune 2000 or Command & Conquer if you want. Besides that, Shooters - and even those are more and more Multiplayer only, take a look at Joint Operations, the latest Installment in the Delta Force series from Novalogic. They failed to provide interesting single player levels in their latest games, so they went online only and hope that players provide the fun they did not include.
I really enjoyed "Kotor2", it is a modernized old-style adventure. But I fear there will not be many more in the next time...
If this posting did not have too much sense, forgive me, just my thoughts about gaming.