"Need" is a strong word.
At the most basic level, Humans need oxygen, food, water, & a livable tempature range to survive. Without these resources, we would not last long at all. Over the long term, we also need things like shelter, medicine & companionship to stay happy & healthy.
Then there are lesser "needs" that facilitate our lives & make them easier. We need to speak the langauge of the area we live in. Some people need private transportaion. Some people need bus passes. Almost everyone needs a hammer now & then. I occasionally "need" a giant slushy from the Sonic down the road.
One hundred years ago, computers were not invented, and people got along fine without them. They were not "needed" back then. I doubt that there are many people that would want to give up their computers and go back to those days, though. We could do it, but it would make many tasks more difficult or impossible to do. They are "needed" now.
I think that if paranormal things like psi-powers and communication with the dead are ever proven to be real, people will find uses for them. As a matter of fact, some companies like Sony have already tried to harness psi-powers. If the day comes, people will quickly get used to having their psi- powered gizmos, and think "How did we ever do without this?"

Regards, Canis