Can Bitcoin developers kill Counterparty by changing the protocol? Theoretically? I like Counterparty, but a bit concerned on this issue.
No they can't. See my previous post for more info.
Also confirmed by XCP founder PhantomPhreak:
That is FUD. There are many ways to store Counterparty data in the blockchain. It's not leaving any time soon, no worries. Everything is stored in the blockchain, and cannot be changed or manipulated without manipulating the blockchain itself.
That's right. It's pretty much impossible to prevent Counterparty from using Bitcoin, because of the many ways in which Counterparty can store data in the blockchain.