Because a crapload of stuff was announced at the event:
Ninja Gaiden Sigma 2 for PS3 including online Co-Op (missions only) & playable Ayane (from Dead or Alive) & Momiji (from the DS Ninja Gaiden)
Virtual Console now has Arcade games. Gaplus, Star Force, The Tower of Druaga, Mappy & Space Harrier (coming soon) have been added, all for 500 points except Gaplus, which is 600). Go ahead & speculate on what might make it on
Original US NES/SNES Final Fantasys coming to Virtual Console (Why?) along w/ Final Fantasy IV: The After Years & Final Fantasy Crystal Chronicles: My Life As A Darklord
Legend of Zelda: Spirit Tracks announced for DS, coming this year (yes, it's going to involve trains & play like Phantom Hourglass).
See the 1st trailer here. PS: You can now download games directly to an SD card.
New system update (4.0) for Wii allows you to launch channels that you have saved on an SD card (32GB is the maximum card you can use). Finally, you can play VC games on other Wiis.
Watch it in action OnLive, basically a "gaming-on-demand". Check Gametrailers.com for videos about it that explain it better.
Sony is hoping to add more PSP stuff, like PS One Classics & improving the PSN store.
Space Invaders Extreme coming to Xbox Live in HD.
"DSi enhanced game cards" are being developed, which just means if the game using those cards has customization (i.e Animal Crossing), then it'll allow you to use photos that you've taken or use the camera for something.
FREAKIN' PUNCH-OUT!! Doc Louis! The pink sweater & the bike scene!!
More stuff to come. & in case you're wonder why there's so much Nintendo stuff, it was Nintendo's Keynote Speech today, w/ Microsoft & Sony to follow in the upcoming days.