In April 2013, IDC said that tablet sales would be at 410 million by 2017.
In August 2013, Forrester research announce [or predicted] that tablets will become a mainstay of households in developed markets by 2017, with 60% of online consumers in North America and 42% in European owning one by 2017. Or by percentage, roughly a 25.6% increase compounded annually to maybe 381 million by 2017.
So who do you believe? These so-called research companies don't know their butt from their elbow. Not saying they are wrong this time but look what they said just over a year ago: huge sales in tablets!
These same companies predicted sales in netbooks at 130 million in 2013. Manufacturers stopped manufacturing them in January 2013.