I guess we would eventually go there. Machines are going to become better friends/partners at some point, because humans are flawed. Not simply “flawed like anything real”, but too flawed. They have limited time and emotional energy and so on. If the majority of humanity will spent their time with AI that is capable of making them happier/more motivated/more productive than humans would won’t benefits overshadow the downsides?
P.S. There is a creepy feeling coming from the world of people disconnected from each other, but I think it comes from the fear of the unknown(or known, but really weird like dating a rock). But I may be simply too biased.
On another note, serious physical activity is something people might want to avoid while thinking hard. I remember reading that cognitive performance is weakened when brain is concerned with coordinating your movement and maintaining balance. This probably applies only to harder physical activities like lifting.