People aren't ditching desktops
People aren't ditching their desktops. They're just not replacing them. Ditto laptops. If there's nothing wrong with the one you've got, then why buy another.
Contrast that with those who absolutely must thrown their money at the latest thing. They're the ones buying the tablets, along with those who simply see the value of having a tablet as well as the existing laptop/desktop/whatever.
There's also he stupidly inflated price of HDDs to consider. They're still not back to pre-flood levels.