They already said they move hosts around from role to role, where the scripts determine how they behave in their world. It might be difficult for most people to understand this, but the hosts are purely script-driven, meaning they have no genuine emotion or relation to anything in the world, even if the show (based on the movie) still introduces a magical component where they somehow can relate, and not just based on re-associating older scripts. We'll have to wait and see how much they hold on to those real-science (to an extend) principles until the show itself goes 'off-script' into fantasy.
It is somewhat unfortunate that they based it directly on the movie, since the movie illustrates many of the concepts (like the hosts being inactive at night, while being repaired) that people have been asking about. Also, the '30 years without incident' and the storage space makes the movie canon, so it's basically mandatory viewing anyway.
What does bother me about that in terms of world rules as compared to reality, is that it renders the show kind of moot, since the original Westworld (and Romanworld, and another area) already had its robots running amok. In 30 years, with superior technology, nobody has grown tired of this park, nor have the robots revolted before? That's hard to believe. They may try to compensate for that later on though.