Well there are few games announced in 2007 including Mario Kart so it only means that if there is... Kid Icarus will not be the only one that will announced at E3. Unless most of the games that will announced are third party games which is really unlikely.
end of core gaming days prediction:
E3 2006-The beginning of the end. Wii introduced
E3 2008- Armageddon. Wii motion plus introduced. Wii Music. Reggie says Animal crossing was a core game. Massive disappointment. many Wii core gamers selling their Wii.
E3 2010- Tape runs out
http://www.fivedoves.com/letters/march2009/ICG_Tape_runs_out.jpg