More to the point, it obsoletes just about all the code I've ever written. Bah humbug, I say.
I doubt you're the only one who feels scrooged, but I don't quite think it's that bad. 32-bit Carbon code will still run just fine on 64-bit machines on 10.5. Finder is still Carbon, and it appears that the only 32-bit app shipping on Leopard is Xcode. I can't even imagine Apple pulling Carbon in 10.6. My guess is 10.7, which would put it 3-4 years away, at Apple's current pace. But, I guess stranger things have happened.
And once Apple does pull it, someone will just emulate it, anyway. Nothing ever dies with emulation.