Which products, used by few today, will be essential in five years?

Online Television. Not many people use it currently, mainly because it is just beginning to develop, but soon TV will be replaced by the internet. People will be able to just watch any show they want on their computers. And soon, as technology advances, people will be able to carry their TVs anywhere they want. So that stationary TV at the home will no longer be acceptable because it is too limiting. TIVO revolutionized the TV, but Internet TV will replace the TV in general. There are many details that i cannot discuss, but all i can say is that TVs are going to be this generation's VHS.