Happiness is difficult to measure, but I believe that a large portion of it is what I wrote on this post.
Maybe if the AI's of the future don't go all "Terminator" on us we can have nearly everything we desire. Only that 'Hedonistic Adaptation' tends to come along and establish our new baseline emotional amount. Once something becomes our norm, we have the tendency to seek more.
So future advancements won't really help make people more happy. That is my belief.