Ctein article about predicting the future (he's done it professionally), and some surprise factors. Emphasis on the staggering growth of need of storage space.
For the first couple of years, the whole of Domai.com easily fit on a 50MB allocation web hotel. Today, one day's update is near that!
And I am deliberately conservative about it, some competing sites update with gigabytes every day! (Which I find ridiculous, but it seems there's a market for it.)