Music mobiles a threat to iPod and other portable music players?

Are the new music mobiles like the Motorola's ROKR iTunes, the Walkman branded Sony Ericsson W800i, or the newly launched Nokia 6630 Music Edition a significant threat to Apple´s iPod and other MP3 players?

Experts in the field say Apple, Creative, Rio and other MP3 player makers are, for now, safe from cell phone manufacturing rivals, but they think that Music-centric cell phones will clearly have some impact on the portable music player sales. Is the average music consumer going to buy the iPod Nano if he has a Nokia 6630 Music Edition or a N91 music smartphone, which has a 4 GB hard drive?

More about this can be found here: Nokia Blog