I don't think that there's a chance in hell. Nokia's problem is that everything about Ovi feels like beta and they aren't developing it fast enough for it to be a service I personally would start using any time soon.

The Apple store is ready, functional and immensely popular. Apple's downfall is going to be not reinventing itself enough, but only after everyone has already bought an iPhone/iPod touch once and want to collectively try something new.