It’s a great misfortune that we don’t have data about the future. It makes it hard to tell what’s going to happen.
It’s even harder because although sometimes we have data about the past, the past and the future don’t always look the same.
Clearly that’s what makes predictions about mobile computing platforms tricky. Nothing that has happened recently had been predicted by those who had tried to do so in the past.
The difficulty is compounded if trying to forecast in the long term like 4 or 5 years ahead. The tendency is to extrapolate what has been happening to date.