My friend, Suraj, has this to say about the success of smart-phones/tablets:
It is not the jazzy UI or touch abilities that drive the success of smart-phones and tablets. The real reason is that now more and more people are addicted to internet & social media, and for accessing that, regular PCs/Desktops are an overkill. Smart-phones and tablets are handy devices offering connectivity to all your on-line activities, and this is the reason behind their success.Well said.