They don't upgrade, it's a tiny percentage that upgrade.
Want? I said they don't need a desktop as mobile devices gain market share and acceptance people will change. Again this Si future, not last year or two. Thats why you haven't seen a change yet, comeback in 4 years and tell me you haven't seen your market drastically change and then tell me how your upgrades are doing in a decade, where they'll be non existent for home users. People still doing it, will be us lot who want need to pay.
Wphow we use computers is changing, what we use computers for has changed. The future is simplicity and throw away devices. Not upgradable baige boxes.
Fail to predict the future, fail to stay relevant.
Just what's happened to Nokia and Ms, in the last 4 or so years.