I think you have lots to look forward to bud:
Star Wars: Rogue Leader 3
F-Zero
Mario Kart
Mario Golf
Mario Tennis
Final Fantasy: Crystal Chronicles
Metal Gear(new exclusive one)
Mario 128(true sequel to Mario 64)
Metroid Prime 2
Animal Crossing 2
Pikmin 2
Starfox Armada
Inhuman(from the makers of Eternal Darkness)
Resident Evil 4
And those are just ones that I can think of that are exclusive to Gamecube. Some 3rd party titles that I can think of are:
Soul Calibur 2(with Link as an exclusive character)
Viewtiful Joe
PN03
Killer 7
Dead Phoenix
etc
(can't think of any more off the top of my head)
In any event, I don't think you should have any worries about not having quality titles to play on your cube in the months to come. It looks as though there will be a plethora of great titles to play. Now, if I just had the time to play them
