Everything in IT is a Fad
According to Bill Gates, the Internet was a passing fad. Just before PCs, mainframes were a fad. I remember 3.5" floppy disks were a BIG fad. Today, some are trying to make the term "cloud" be a fad but not too many realize the difference between private and public clouds. Once there is a huge breach of private data (credit card numbers, SSNs, medical information...) that will be a passing fad too.
It is too early to tell if tablets will be a fad yet. Just because huge numbers of tablets were sold, that doesn't mean that there won't be a decline.
Oh, and articles in Wikipedia are not writen by experts. I don't trust that as a source for anything.