I think the problem is that most people use mobile phones, rather then computer workstations. In the 90's everyone had a proper PC workstation. But now people have touch screens instead. You wont type long blog posts or participate in lengthy forum discussions using a touch screen. If you would put a graph with PC sales vs pads and phones showing the last 30 years you would see where it shifted from creating/consuming to passive/consuming. There are still normal PC users, it's just that the number have now grown much, while the number of touch screen users has grown exponentially.