Yes, the observation destroys the entanglement. The communication does not really happen between the state that is 'teleported' - you still have to manually se

Yes, the observation destroys the entanglement. The communication does not really happen between the state that is 'teleported' - you still have to manually send the photons 6km or whatever. But - very crudely - you can pass information from one entangled particle to it's pair 6km away and observe the results. So, you still have to have a fiber or whatever. Also - because it's all probabilistic and you don't know for sure if it worked in any given instance, you still need another classical channel to communicate information about what was passed in the first place.