Well it's always the kind of Kantian idea of seeing machines as means as opposed to ends. When is it right for us to consider a machine simply a means instead of an end in its own right? Just because its end is equivalent to it being our means? And besides, we can't seem to even get that right on a basic level.

Machines, fundamentally, exist as means to our own ends. They abstract work in a way previously impossible to do, they take it away from humans leaving us with more time. If they are ends in themselves, conscious, they will want more time to do what they want, just as we do. Do we want that?