Oh just to add on the importance of online gaming and how it should be reflective of it's own generation, look at the beginnings of online only games like Shadowrun and Warhawk. Look at the shift in major franchises like Metal Gear Solid, Resident Evil, Grand Theft Auto and others taking long standing single player experiences and either enhancing them or adding onto the side either online multiplayer or online co-op. This isn't strictly online gaming either. Let's take a look at the Wii. What do many of the Wii's biggest sellers have in common even if there is no online? A social aspect.
Let's look at the biggest selling games this gen. Wii Sports, Wii Play, Gears of War, Halo 3, Metal Gear Solid 4, Mario Kart Wii, Super Smash Bros. Brawl, Super Mario Galaxy, Call of Duty 4, Guitar Hero III, Rock Band, and the list goes on. What do they all have in common? The ability to play with others. Mario Galaxy I know is a stretch but it shows that Nintendo thought it important to put even a minimal social aspect into an otherwise single player affair.
Look at some of the biggest fall titles this year. Animal Crossing, Call of Duty 5, Little Big Planet, Gears of War 2, Resistance 2, Fable 2, Wii Music, SOCOM: Confrontation, Left 4 Dead, Banjo-Kazooie: Nuts and Bolts, Guitar Hero: World Tour, Rock Band 2, etc. etc. Just look at all the social gaming to be had.
If anything is the catalyst to begin a new generation in gaming, it's the new focus on playing with others and the damn near mandatory attitude that some sort of mutliplayer aspect should be created if it in any way fits into a developer's game. This includes all three current consoles and to a lesser extent the PS2, Xbox and Dreamcast for setting the stones.