It's not dead, until no one is using it. You can say APL is dead and I might believe you. So long as there's still people using prolog or other form of logic programming. It's not dead, all it needs is one killer application and everyone will jump on it. Erlang's popularity has surged since Whatsapp got acquired. Lots of people are learning about Erlang's root from Prolog and likewise getting somewhat curious about Prolog.

I might be wrong, but I think where the logic community failed is in taking advantages of multiple processors. Goals can be broken down and shared across multiple core/processors. So without changing code, the same program can be parallelized. It's just seems no one has implemented it yet.