no phone will "kill" the iphone. its not just going to magically take away all the iphone users, especially if its on another network.
also- for any phone to be "better" than the iphone would need to be able to add as many apps as itunes currently holds cause as of right now the apps are the dealbreaker when it comes to fights such as iphone vs pre...for example.
p.s. lol at all the pissed Pre owners whose batteries last 5hrs on stand by
Hard to say there.... I mean 90% of the Apps are garbage anyway.