Maybe they are waiting for/helping us to evolve enough for us to be able to have a conversation with them. Even 50 years ago almost everyone would have found this idea very difficult, as time goes on it gets better.

We also have no idea of being able to relate to their culture which may be radically different than our own. It might be far far more right wing for example and they might see us as a slave race or supremely inferior, which we will probably be.