I posted another comment above but it reflects on this one as well.
The difference is that napster was centralised even if it was peer to peer. Bitcoin cannot simply disappear in the same way that Bittorent hasn't disappeared, the paradigm is different as there is no central server which tracks the nodes.
The difference is that napster was centralised even if it was peer to peer. Bitcoin cannot simply disappear in the same way that Bittorent hasn't disappeared, the paradigm is different as there is no central server which tracks the nodes.